Visual Studio won't sync anymore

I have this error and now my Visual Studio won't sync with Unity anymore.

Does anyone have a clue why?

ArgumentException: Value does not fall within the expected range.
SyntaxTree.VisualStudio.Unity.Bridge.CompilationUnit.LanguageOf (SyntaxTree.VisualStudio.Unity.Bridge.CompilationUnit unit)
SyntaxTree.VisualStudio.Unity.Bridge.CompilationUnit.CompilationUnits ()
SyntaxTree.VisualStudio.Unity.Bridge.ProjectSystem.UnitySolutionBuilder..ctor ()
SyntaxTree.VisualStudio.Unity.Bridge.ProjectSystem.UnitySolutionBuilder.CreateSolutionFromAssetDatabase ()
SyntaxTree.VisualStudio.Unity.Bridge.ProjectFilesGenerator.GenerateProject ()
SyntaxTree.VisualStudio.Unity.Bridge.ProjectFilePostprocessor.OnPreGeneratingCSProjectFiles ()
System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Reflection/MonoMethod.cs:222)
Rethrow as TargetInvocationException: Exception has been thrown by the target of an invocation.
System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Reflection/MonoMethod.cs:232)
System.Reflection.MethodBase.Invoke (System.Object obj, System.Object[] parameters) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Reflection/MethodBase.cs:115)
UnityEditor.AssetPostprocessingInternal.OnPreGeneratingCSProjectFiles () (at C:/buildslave/unity/build/Editor/Mono/AssetPostprocessor.cs:61)
UnityEditor.VisualStudioIntegration.SolutionSynchronizer.Sync () (at C:/buildslave/unity/build/Editor/Mono/VisualStudioIntegration/SolutionSynchronizer.cs:189)
UnityEditor.SyncVS.CreateIfDoesntExist () (at C:/buildslave/unity/build/Editor/Mono/SyncProject.cs:147)
UnityEditor.EditorGUILayoutropertyField(SerializedProperty, GUILayoutOption[])
Sirenix.OdinInspector.Editor.InspectorUtilities:BeginDrawPropertyTree(PropertyTree, Boolean) (at C:/Sirenix/Sirenix Solution/Sirenix.OdinInspector.Editor/Core/Infos/InspectorPropertyInfo.cs:464)
Sirenix.OdinInspector.Editor.PropertyTreeraw(Boolean) (at C:/Sirenix/Sirenix Solution/Sirenix.OdinInspector.Editor/Utilities/Persistent/PersistentContextCache.cs:416)
Sirenix.OdinInspector.Editor.OdinEditor:OnInspectorGUI() (at C:/Sirenix/Sirenix Solution/Sirenix.OdinInspector.Editor/Misc/DrawerPriorityAttribute.cs:44)
UnityEngine.GUIUtilityrocessEvent(Int32, IntPtr)

 

Thanks for taking interest.
This only happens in my big project and by synchronizing I mean that my solution's scripts are not up-to-date, as an example if I create a new script Test.cs it won't show up in my Solution Explorer.

So VS intellisense gives me errors by saying some classes are not found but when playing the game it works fine because Unity recognizes there are actually no errors as it does find the classes VS doesn't find.

 

I have exactly the same error:

https://forum.unity.com/threads/err...t-not-updating-when-new-scripts-added.511761/

 

This is a known issue.
https://issuetracker.unity3d.com/is...eating-slash-deleting-script-in-visual-studio

There have been a number of updates to both Unity and VS lately in this general area to fix related bugs. What version of Unity and VS are you running? I suspect there are probably some Unity/VS version combinations that trigger this.

 

Unity 2017.3.0f3 and VS 2017.

I think the problem might be due to something I have in my project because I don't have this problem in new projects.

Is there a way I can track where the problem comes from in my big project?

 

Do you have the unity visual studio tools installed separately? If so try removing those as they come with now. I saw a related post that said someone had similar issues because of that.

I'm using the latest 2017.3 patch release and latest VS 2017 also, and not having issues. So if your VS is the very latest I would suspect something like the separate install of VS tools for unity maybe being the cause.

 

If it was related to my Visual Studio why would it work fine in other projects? I don't think that's the issue in my case.

Visual Studio Tools was installed during the Visual Studio installation.

EDIT: You may be right because it works fine with Visual Studio 2015.
Opening with 2015 allowed me to sync the 2017 version, but upon using the 2017
the error comes back.

I will try to reinstall 2017 but it's a long and annoying process with all the plugins so for now I'll stick to 2015.

 

I have the same problem to, with Visual studio 2013 and 2017 in Unity 2017.3 it wont start Visual studio when I click the Assets/Open C# Project just gives me the error below. And if I create a new script in Unity and have the project open in visual studio it wont appear there and I cant get the project to reload to show it. This all used to work perfectly but has now stopped working. I have installed the Post Processor Stack V2 which I think currently is the cause of the problem somehow.

ArgumentException: Value does not fall within the expected range.
SyntaxTree.VisualStudio.Unity.Bridge.CompilationUnit.LanguageOf (SyntaxTree.VisualStudio.Unity.Bridge.CompilationUnit unit)
SyntaxTree.VisualStudio.Unity.Bridge.CompilationUnit.CompilationUnits ()
SyntaxTree.VisualStudio.Unity.Bridge.ProjectSystem.UnitySolutionBuilder..ctor ()
SyntaxTree.VisualStudio.Unity.Bridge.ProjectSystem.UnitySolutionBuilder.CreateSolutionFromAssetDatabase ()
SyntaxTree.VisualStudio.Unity.Bridge.ProjectFilesGenerator.GenerateProject ()
SyntaxTree.VisualStudio.Unity.Bridge.ProjectFilePostprocessor.OnPreGeneratingCSProjectFiles ()
System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Reflection/MonoMethod.cs:222)
Rethrow as TargetInvocationException: Exception has been thrown by the target of an invocation.
System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Reflection/MonoMethod.cs:232)
System.Reflection.MethodBase.Invoke (System.Object obj, System.Object[] parameters) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Reflection/MethodBase.cs:115)
UnityEditor.AssetPostprocessingInternal.OnPreGeneratingCSProjectFiles () (at C:/buildslave/unity/build/Editor/Mono/AssetPostprocessor.cs:61)
UnityEditor.VisualStudioIntegration.SolutionSynchronizer.Sync () (at C:/buildslave/unity/build/Editor/Mono/VisualStudioIntegration/SolutionSynchronizer.cs:189)
UnityEditor.SyncVS.SyncVisualStudioProjectIfItAlreadyExists () (at C:/buildslave/unity/build/Editor/Mono/SyncProject.cs:165)

 

Same here, It happened after I installed the post processing pack 2 from github.
Pretty sure it has something to do with the new assembly definition stuff.
I appended CSharp to both of the assembly definition names that the processing stuff uses and it seems to have gone away but still getting project errors sometimes.

 

Ah good to know Korno, I installed the post processing stack 2 from Github too. I'll remove it now and see what happens.

EDIT: It's now fixed as soon as I removed the processing stack 2!

 

if enther the program i have this error all error is for unity 2018.1.0b4

1
ArgumentException: Value does not fall within the expected range.
SyntaxTree.VisualStudio.Unity.Bridge.CompilationUnit.LanguageOf (SyntaxTree.VisualStudio.Unity.Bridge.CompilationUnit unit)
SyntaxTree.VisualStudio.Unity.Bridge.CompilationUnit.CompilationUnits ()
SyntaxTree.VisualStudio.Unity.Bridge.ProjectSystem.UnitySolutionBuilder..ctor ()
SyntaxTree.VisualStudio.Unity.Bridge.ProjectSystem.UnitySolutionBuilder.CreateSolutionFromAssetDatabase ()
SyntaxTree.VisualStudio.Unity.Bridge.ProjectFilesGenerator.GenerateProject ()
SyntaxTree.VisualStudio.Unity.Bridge.ProjectFilePostprocessor.OnPreGeneratingCSProjectFiles ()
System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Reflection/MonoMethod.cs:222)
Rethrow as TargetInvocationException: Exception has been thrown by the target of an invocation.
System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Reflection/MonoMethod.cs:232)
System.Reflection.MethodBase.Invoke (System.Object obj, System.Object[] parameters) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Reflection/MethodBase.cs:115)
UnityEditor.AssetPostprocessingInternal.OnPreGeneratingCSProjectFiles () (at C:/buildslave/unity/build/Editor/Mono/AssetPostprocessor.cs:61)
UnityEditor.VisualStudioIntegration.SolutionSynchronizer.Sync () (at C:/buildslave/unity/build/Editor/Mono/VisualStudioIntegration/SolutionSynchronizer.cs:198)
UnityEditor.SyncVS.SyncVisualStudioProjectIfItAlreadyExists () (at C:/buildslave/unity/build/Editor/Mono/SyncProject.cs:165)

2
ArgumentException: Value does not fall within the expected range.
SyntaxTree.VisualStudio.Unity.Bridge.CompilationUnit.LanguageOf (SyntaxTree.VisualStudio.Unity.Bridge.CompilationUnit unit)
SyntaxTree.VisualStudio.Unity.Bridge.CompilationUnit.CompilationUnits ()
SyntaxTree.VisualStudio.Unity.Bridge.ProjectSystem.UnitySolutionBuilder..ctor ()
SyntaxTree.VisualStudio.Unity.Bridge.ProjectSystem.UnitySolutionBuilder.CreateSolutionFromAssetDatabase ()
SyntaxTree.VisualStudio.Unity.Bridge.ProjectFilesGenerator.GenerateProject ()
SyntaxTree.VisualStudio.Unity.Bridge.ProjectFilePostprocessor.OnPreGeneratingCSProjectFiles ()
System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Reflection/MonoMethod.cs:222)
Rethrow as TargetInvocationException: Exception has been thrown by the target of an invocation.
System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Reflection/MonoMethod.cs:232)
System.Reflection.MethodBase.Invoke (System.Object obj, System.Object[] parameters) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Reflection/MethodBase.cs:115)
UnityEditor.AssetPostprocessingInternal.OnPreGeneratingCSProjectFiles () (at C:/buildslave/unity/build/Editor/Mono/AssetPostprocessor.cs:61)
UnityEditor.VisualStudioIntegration.SolutionSynchronizer.Sync () (at C:/buildslave/unity/build/Editor/Mono/VisualStudioIntegration/SolutionSynchronizer.cs:198)
UnityEditor.SyncVS.SyncSolution () (at C:/buildslave/unity/build/Editor/Mono/SyncProject.cs:192)

and if play buld for pc mode i have this error
1
ArgumentException: Value does not fall within the expected range.
SyntaxTree.VisualStudio.Unity.Bridge.CompilationUnit.LanguageOf (SyntaxTree.VisualStudio.Unity.Bridge.CompilationUnit unit)
SyntaxTree.VisualStudio.Unity.Bridge.CompilationUnit.CompilationUnits ()
SyntaxTree.VisualStudio.Unity.Bridge.ProjectSystem.UnitySolutionBuilder..ctor ()
SyntaxTree.VisualStudio.Unity.Bridge.ProjectSystem.UnitySolutionBuilder.CreateSolutionFromAssetDatabase ()
SyntaxTree.VisualStudio.Unity.Bridge.ProjectFilesGenerator.GenerateProject ()
SyntaxTree.VisualStudio.Unity.Bridge.ProjectFilePostprocessor.OnPreGeneratingCSProjectFiles ()
System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Reflection/MonoMethod.cs:222)
Rethrow as TargetInvocationException: Exception has been thrown by the target of an invocation.
System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Reflection/MonoMethod.cs:232)
System.Reflection.MethodBase.Invoke (System.Object obj, System.Object[] parameters) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Reflection/MethodBase.cs:115)
UnityEditor.AssetPostprocessingInternal.OnPreGeneratingCSProjectFiles () (at C:/buildslave/unity/build/Editor/Mono/AssetPostprocessor.cs:61)
UnityEditor.VisualStudioIntegration.SolutionSynchronizer.Sync () (at C:/buildslave/unity/build/Editor/Mono/VisualStudioIntegration/SolutionSynchronizer.cs:198)
UnityEditor.SyncVS.SyncSolution () (at C:/buildslave/unity/build/Editor/Mono/SyncProject.cs:192)
2
Exception: C:\Program Files\Unity 2018.1.0b4\Editor\Data\il2cpp/build/il2cpp.exe did not run properly!
UnityEditorInternal.Runner.RunProgram (UnityEditor.Utils.Program p, System.String exe, System.String args, System.String workingDirectory, UnityEditor.Scripting.Compilers.CompilerOutputParserBase parser) (at C:/buildslave/unity/build/Editor/Mono/BuildPipeline/BuildUtils.cs:130)
UnityEditorInternal.Runner.RunManagedProgram (System.String exe, System.String args, System.String workingDirectory, UnityEditor.Scripting.Compilers.CompilerOutputParserBase parser, System.Action`1 setupStartInfo) (at C:/buildslave/unity/build/Editor/Mono/BuildPipeline/BuildUtils.cs:73)
UnityEditorInternal.IL2CPPBuilder.RunIl2CppWithArguments (System.Collections.Generic.List`1 arguments, System.Action`1 setupStartInfo, System.String workingDirectory) (at C:/buildslave/unity/build/Editor/Mono/BuildPipeline/Il2Cpp/IL2CPPUtils.cs:349)
UnityEditorInternal.IL2CPPBuilder.ConvertPlayerDlltoCpp (ICollection`1 userAssemblies, System.String outputDirectory, System.String workingDirectory) (at C:/buildslave/unity/build/Editor/Mono/BuildPipeline/Il2Cpp/IL2CPPUtils.cs:330)
UnityEditorInternal.IL2CPPBuilder.Run () (at C:/buildslave/unity/build/Editor/Mono/BuildPipeline/Il2Cpp/IL2CPPUtils.cs:161)
UnityEditorInternal.IL2CPPUtils.RunIl2Cpp (System.String stagingAreaData, IIl2CppPlatformProvider platformProvider, System.Action`1 modifyOutputBeforeCompile, UnityEditor.RuntimeClassRegistry runtimeClassRegistry) (at C:/buildslave/unity/build/Editor/Mono/BuildPipeline/Il2Cpp/IL2CPPUtils.cs:41)
DesktopStandalonePostProcessor.SetupStagingArea (BuildPostProcessArgs args) (at C:/buildslave/unity/build/Editor/Mono/BuildPipeline/DesktopStandalonePostProcessor.cs:172)
DesktopStandalonePostProcessor.PostProcess (BuildPostProcessArgs args) (at C:/buildslave/unity/build/Editor/Mono/BuildPipeline/DesktopStandalonePostProcessor.cs:18)
UnityEditor.Modules.DefaultBuildPostprocessor.PostProcess (BuildPostProcessArgs args, UnityEditor.BuildProperties& outProperties) (at C:/buildslave/unity/build/Editor/Mono/Modules/DefaultBuildPostprocessor.cs:27)
UnityEditor.PostprocessBuildPlayer.Postprocess (BuildTargetGroup targetGroup, BuildTarget target, System.String installPath, System.String companyName, System.String productName, Int32 width, Int32 height, BuildOptions options, UnityEditor.RuntimeClassRegistry usedClassRegistry, UnityEditor.Build.Reporting.BuildReport report) (at C:/buildslave/unity/build/Editor/Mono/BuildPipeline/PostprocessBuildPlayer.cs:285)
UnityEngine.GUIUtilityrocessEvent(Int32, IntPtr)
3
Error building Player: 3 errors
4
Build completed with a result of 'Failed'
UnityEngine.GUIUtilityrocessEvent(Int32, IntPtr)
5
UnityEditor.BuildPlayerWindow+BuildMethodException: 4 errors
at UnityEditor.BuildPlayerWindow+DefaultBuildMethods.BuildPlayer (BuildPlayerOptions options) [0x0021f] in C:\buildslave\unity\build\Editor\Mono\BuildPlayerWindowBuildMethods.cs:182
at UnityEditor.BuildPlayerWindow.CallBuildMethods (Boolean askForBuildLocation, BuildOptions defaultBuildOptions) [0x00065] in C:\buildslave\unity\build\Editor\Mono\BuildPlayerWindowBuildMethods.cs:89
UnityEngine.GUIUtilityrocessEvent(Int32, IntPtr)

 

I think you guys should check your project root folder wherever the .csproj of your Visual Studio is and remove anything that's unnecessary.

 

Getting this everytime I trying to open a script in a new clean project
VS 2015 pro
Unity 2018.2.0b1

 

All my projects updated to 2018.1 throw this error. My older projects using 2017.3.1f1 function normally.

I also cleaned out all unnecessary files where there .csproj is located with no change.

Code (CSharp):

1. ArgumentException: Value does not fall within the expected range.
2. SyntaxTree.VisualStudio.Unity.Bridge.CompilationUnit.LanguageOf (SyntaxTree.VisualStudio.Unity.Bridge.CompilationUnit unit)
3. SyntaxTree.VisualStudio.Unity.Bridge.CompilationUnit.CompilationUnits (System.String method)
4. SyntaxTree.VisualStudio.Unity.Bridge.CompilationUnit.CompilationUnits ()
5. SyntaxTree.VisualStudio.Unity.Bridge.ProjectSystem.UnitySolutionBuilder..ctor ()
6. SyntaxTree.VisualStudio.Unity.Bridge.ProjectSystem.UnitySolutionBuilder.CreateSolutionFromAssetDatabase ()
7. SyntaxTree.VisualStudio.Unity.Bridge.ProjectFilesGenerator.GenerateProject ()
8. SyntaxTree.VisualStudio.Unity.Bridge.ProjectFilePostprocessor.OnPreGeneratingCSProjectFiles ()
9. System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Reflection/MonoMethod.cs:222)
10. Rethrow as TargetInvocationException: Exception has been thrown by the target of an invocation.
11. System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Reflection/MonoMethod.cs:232)
12. System.Reflection.MethodBase.Invoke (System.Object obj, System.Object[] parameters) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Reflection/MethodBase.cs:115)
13. UnityEditor.AssetPostprocessingInternal.OnPreGeneratingCSProjectFiles () (at C:/buildslave/unity/build/Editor/Mono/AssetPostprocessor.cs:91)
14. UnityEditor.VisualStudioIntegration.SolutionSynchronizer.Sync () (at C:/buildslave/unity/build/Editor/Mono/VisualStudioIntegration/SolutionSynchronizer.cs:196)
15. UnityEditor.SyncVS.SyncVisualStudioProjectIfItAlreadyExists () (at C:/buildslave/unity/build/Editor/Mono/SyncProject.cs:163)

 

This thread might be helpful in some cases: https://forum.unity.com/threads/sol...ves-errors-cant-talk-to-visual-studio.529529/

 

I had this error

Code (CSharp):

1. ArgumentException: Value does not fall within the expected range.

when I updated unity to 2018.1
To fix, I removed the unity plugin for visual studios. Then updated visual studios.
I closed and reopened Unity and did Assets>Open C# project
Then my solution built and I could see all my files again in visual studios

 

Thanks dmangames, it did the trick

 

I have tried every single fix that I can find on the web.

• Unity 2018.1.0f2 64bit
• vs 2017 community
• fresh installs of both vs and unity
• new project, old project, all the same.
• tried using older versions of vs

Error message in unity.

Code (CSharp):

1. ArgumentException: Value does not fall within the expected range.
2. SyntaxTree.VisualStudio.Unity.Bridge.CompilationUnit.LanguageOf (SyntaxTree.VisualStudio.Unity.Bridge.CompilationUnit unit)

No sln files. I cannot even ignore the problem as it causes builds to fail.

Update. I now have a solution file, I am not sure what changed, other than setting unity external tools to vs2015 (tried this last night with no luck, not sure why it is working today). But now I am getting this in my vs ActivityLog.

Code (CSharp):

1. System.IO.FileNotFoundException: Could not load file or assembly 'Microsoft.CodeAnalysis, Version=1.3.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified. File name: 'Microsoft.CodeAnalysis, Version=1.3.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' at SyntaxTree.VisualStudio.Unity.Editor.MessageClassificationTagger.IsMessageIdentifierSpan(SnapshotSpan span) at SyntaxTree.VisualStudio.Unity.Editor.MessageClassificationTagger.<GetTags>d__7.MoveNext() at Microsoft.VisualStudio.Text.Tagging.Implementation.TagAggregator`1.<GetTagsForBuffer>d__38.MoveNext() WRN: Assembly binding logging is turned OFF. To enable assembly bind failure logging, set the registry value [HKLM\Software\Microsoft\Fusion!EnableLog] (DWORD) to 1. Note: There is some performance penalty associated with assembly bind failure logging. To turn this feature off, remove the registry value [HKLM\Software\Microsoft\Fusion!EnableLog].

 

Could you please elaborate on where the Visual Studio Plugin for Unity is, and how to uninstall/reinstall it?

 

Had this issue for months, this did the trick, thanks!

 

I had a similar problem - I solved it by adding a .cs file (of unity monobehaviour) in Visual Studio instead in Unity.
The file appeared in Unity and I connected it with the script component, and also it was sync by Visual Studio.
If someone wants screen shots for more explanation send me a reply or something.

 

I just had the same problem. Unity 2017.3.0p3, Visual Studio 2017 15.0.

Solved it by updating Visual Studio 2017 to the latest version, 15.9.7. Updating only did not fix the problem promptly: after I finished the installation, the wizard stayed open and gave me te option to repair my installation, which I did and finally fixed the issue.

Not sure if it made any difference, but before updating VS I deleted all the .csproj and .sln from my Unity project folder.