Can't build for UWP because "Reference Rewriter found some errors..."

I get several errors which look to me like Unity tests dll is for some reason trying to be included in th build. This is with .Net scripting backend. Il2cpp works but I can't use that for my project.

First i get this error:

Reference Rewriter found some errors while running with command --target="Temp\StagingArea\UnityEngine.TestRunner.dll" --additionalreferences="Temp\StagingArea","C:\Program Files (x86)\Windows Kits\10\UnionMetadata\10.0.16299.0\Facade","C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.ApplicationModel.Calls.CallsVoipContract\2.0.0.0","C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.ApplicationModel.SocialInfo.SocialInfoContract\2.0.0.0","C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.ApplicationModel.StartupTaskContract\2.0.0.0","C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.Devices.Custom.CustomDeviceContract\1.0.0.0","C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.Devices.DevicesLowLevelContract\3.0.0.0","C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.Devices.Printers.PrintersContract\1.0.0.0","C:\Program Files (x86)\Windows
... and it goes on like this....

Then I get 1 error like this:

Reference rewriter: Error: method `System.Double System.DateTime::ToOADate()` doesn't exist in target framework. It is referenced from UnityEngine.TestRunner.dll at UnityEngine.TestTools.TestRunner.TestResultSerializer UnityEngine.TestTools.TestRunner.TestResultSerializer::MakeFromTestResult(NUnit.Framework.Internal.TestCaseResult).
UnityEngine.Debug:LogError(Object)
PostProcessWinRT:RunReferenceRewriter() (at C:/buildslave/unity/build/PlatformDependent/MetroPlayer/Extensions/Managed/PostProcessWinRT.cs:983)
PostProcessWinRTrocess() (at C:/buildslave/unity/build/PlatformDependent/MetroPlayer/Extensions/Managed/PostProcessWinRT.cs:211)
UnityEngine.GUIUtilityrocessEvent(Int32, IntPtr)

and about 10 errors like this:

Reference rewriter: Error: method `System.Reflection.FieldInfo System.Type::GetField(System.String,System.Reflection.BindingFlags)` doesn't exist in target framework. It is referenced from UnityEngine.TestRunner.dll at System.Void UnityEngine.TestTools.TestRunner.TestResultSerializer::RestoreTestResult(NUnit.Framework.Internal.TestCaseResult).
UnityEngine.Debug:LogError(Object)
PostProcessWinRT:RunReferenceRewriter() (at C:/buildslave/unity/build/PlatformDependent/MetroPlayer/Extensions/Managed/PostProcessWinRT.cs:983)
PostProcessWinRTrocess() (at C:/buildslave/unity/build/PlatformDependent/MetroPlayer/Extensions/Managed/PostProcessWinRT.cs:211)
UnityEngine.GUIUtilityrocessEvent(Int32, IntPtr)

I tried deleting all unit tests but that changed nothing.

I can't reproduce this, my project has tons of dependencies and is too large to send so I'm not sure I could make a proper bug report of this. Not sure it is a bug, could be something I messed up somewhere

 

Thanks a bunch, this worked!! I would never have found this on my own!

I tried playmode testing a few months ago and forgot that I had enabled it.