Unity Win32Exception: Access is Denied. unity_csc.bat

Good morning

I have just installed Unity 2019.1 latest build and whenever I open a new project I receive two of these error messages in the console. This happens even before I try and play an empty project.

Win32Exception: ApplicationName='C:\Program Files\Unity\Editor\Data\Tools\RoslynScripts\unity_csc.bat', CommandLine='/noconfig @temp/UnityTempFile-fa81a2f614e027340a67c767a28a46ea', CurrentDirectory='', Native error= Access is denied.

Win32Exception: ApplicationName='C:\Program Files\Unity\Editor\Data\Tools\RoslynScripts\unity_csc.bat', CommandLine='/noconfig @temp/UnityTempFile-fa81a2f614e027340a67c767a28a46ea', CurrentDirectory='', Native error= Access is denied.
System.Diagnostics.Process.StartWithCreateProcess (System.Diagnostics.ProcessStartInfo startInfo) (at <c9226b2f33b7421e85bb391f94075e49>:0)
System.Diagnostics.Process.Start () (at <c9226b2f33b7421e85bb391f94075e49>:0)
(wrapper remoting-invoke-with-check) System.Diagnostics.Process.Start()
UnityEditor.Utils.Program.Start (System.EventHandler exitCallback) (at C:/buildslave/unity/build/Editor/Mono/Utils/Program.cs:44)
UnityEditor.Utils.Program.Start () (at C:/buildslave/unity/build/Editor/Mono/Utils/Program.cs:28)
UnityEditor.Scripting.Compilers.MicrosoftCSharpCompiler.StartCompilerImpl (System.Collections.Generic.List`1[T] arguments, System.String argsPrefix) (at C:/buildslave/unity/build/Editor/Mono/Scripting/Compilers/MicrosoftCSharpCompiler.cs:106)
UnityEditor.Scripting.Compilers.MicrosoftCSharpCompiler.StartCompiler () (at C:/buildslave/unity/build/Editor/Mono/Scripting/Compilers/MicrosoftCSharpCompiler.cs:141)
UnityEditor.Scripting.Compilers.ScriptCompilerBase.BeginCompiling () (at C:/buildslave/unity/build/Editor/Mono/Scripting/Compilers/ScriptCompilerBase.cs:60)
UnityEditor.Scripting.ScriptCompilation.CompilationTask.QueuePendingAssemblies () (at C:/buildslave/unity/build/Editor/Mono/Scripting/ScriptCompilation/CompilationTask.cs:286)
UnityEditor.Scripting.ScriptCompilation.CompilationTask.Poll () (at C:/buildslave/unity/build/Editor/Mono/Scripting/ScriptCompilation/CompilationTask.cs:186)
UnityEditor.Scripting.ScriptCompilation.EditorCompilation.CompileScriptAssemblies (UnityEditor.Scripting.ScriptCompilation.ScriptAssembly[] scriptAssemblies, UnityEditor.Scripting.ScriptCompilation.ScriptAssemblySettings scriptAssemblySettings, System.String tempBuildDirectory, UnityEditor.Scripting.ScriptCompilation.EditorScriptCompilationOptions options, UnityEditor.Scripting.ScriptCompilation.CompilationTaskOptions compilationTaskOptions, UnityEditor.Scripting.ScriptCompilation.EditorCompilation+CompileScriptAssembliesOptions compileScriptAssembliesOptions) (at C:/buildslave/unity/build/Editor/Mono/Scripting/ScriptCompilation/EditorCompilation.cs:1307)
UnityEditor.Scripting.ScriptCompilation.EditorCompilation.CompileCustomScriptAssemblies (UnityEditor.Scripting.ScriptCompilation.ScriptAssemblySettings scriptAssemblySettings, System.String tempBuildDirectory, UnityEditor.Scripting.ScriptCompilation.EditorScriptCompilationOptions options, UnityEditor.BuildTargetGroup platformGroup, UnityEditor.BuildTarget platform) (at C:/buildslave/unity/build/Editor/Mono/Scripting/ScriptCompilation/EditorCompilation.cs:1225)
UnityEditor.Scripting.ScriptCompilation.EditorCompilation.CompileCustomScriptAssemblies (UnityEditor.Scripting.ScriptCompilation.EditorScriptCompilationOptions options, UnityEditor.BuildTargetGroup platformGroup, UnityEditor.BuildTarget platform) (at C:/buildslave/unity/build/Editor/Mono/Scripting/ScriptCompilation/EditorCompilation.cs:1218)
UnityEditor.Scripting.ScriptCompilation.EditorCompilationInterface+<CompileCustomScriptAssemblies>c__AnonStorey4.<>m__0 () (at C:/buildslave/unity/build/Editor/Mono/Scripting/ScriptCompilation/EditorCompilationInterface.cs:295)
UnityEditor.Scripting.ScriptCompilation.EditorCompilationInterface.EmitExceptionAsError[T] (System.Func`1[TResult] func, T returnValue) (at C:/buildslave/unity/build/Editor/Mono/Scripting/ScriptCompilation/EditorCompilationInterface.cs:97)
UnityEditor.Scripting.ScriptCompilation.EditorCompilationInterface:CompileCustomScriptAssemblies(EditorScriptCompilationOptions, BuildTargetGroup, BuildTarget)


Win32Exception: ApplicationName='C:\Program Files\Unity\Editor\Data\Tools\RoslynScripts\unity_csc.bat', CommandLine='/noconfig @temp/UnityTempFile-553835d7118366342977fc6fab842167', CurrentDirectory='', Native error= Access is denied.
System.Diagnostics.Process.StartWithCreateProcess (System.Diagnostics.ProcessStartInfo startInfo) (at <c9226b2f33b7421e85bb391f94075e49>:0)
System.Diagnostics.Process.Start () (at <c9226b2f33b7421e85bb391f94075e49>:0)
(wrapper remoting-invoke-with-check) System.Diagnostics.Process.Start()
UnityEditor.Utils.Program.Start (System.EventHandler exitCallback) (at C:/buildslave/unity/build/Editor/Mono/Utils/Program.cs:44)
UnityEditor.Utils.Program.Start () (at C:/buildslave/unity/build/Editor/Mono/Utils/Program.cs:28)
UnityEditor.Scripting.Compilers.MicrosoftCSharpCompiler.StartCompilerImpl (System.Collections.Generic.List`1[T] arguments, System.String argsPrefix) (at C:/buildslave/unity/build/Editor/Mono/Scripting/Compilers/MicrosoftCSharpCompiler.cs:106)
UnityEditor.Scripting.Compilers.MicrosoftCSharpCompiler.StartCompiler () (at C:/buildslave/unity/build/Editor/Mono/Scripting/Compilers/MicrosoftCSharpCompiler.cs:141)
UnityEditor.Scripting.Compilers.ScriptCompilerBase.BeginCompiling () (at C:/buildslave/unity/build/Editor/Mono/Scripting/Compilers/ScriptCompilerBase.cs:60)
UnityEditor.Scripting.ScriptCompilation.CompilationTask.QueuePendingAssemblies () (at C:/buildslave/unity/build/Editor/Mono/Scripting/ScriptCompilation/CompilationTask.cs:286)
UnityEditor.Scripting.ScriptCompilation.CompilationTask.Poll () (at C:/buildslave/unity/build/Editor/Mono/Scripting/ScriptCompilation/CompilationTask.cs:186)
UnityEditor.Scripting.ScriptCompilation.EditorCompilation.CompileScriptAssemblies (UnityEditor.Scripting.ScriptCompilation.ScriptAssembly[] scriptAssemblies, UnityEditor.Scripting.ScriptCompilation.ScriptAssemblySettings scriptAssemblySettings, System.String tempBuildDirectory, UnityEditor.Scripting.ScriptCompilation.EditorScriptCompilationOptions options, UnityEditor.Scripting.ScriptCompilation.CompilationTaskOptions compilationTaskOptions, UnityEditor.Scripting.ScriptCompilation.EditorCompilation+CompileScriptAssembliesOptions compileScriptAssembliesOptions) (at C:/buildslave/unity/build/Editor/Mono/Scripting/ScriptCompilation/EditorCompilation.cs:1307)
UnityEditor.Scripting.ScriptCompilation.EditorCompilation.CompileScripts (UnityEditor.Scripting.ScriptCompilation.ScriptAssemblySettings scriptAssemblySettings, System.String tempBuildDirectory, UnityEditor.Scripting.ScriptCompilation.EditorScriptCompilationOptions options, UnityEditor.Scripting.ScriptCompilation.EditorBuildRules+TargetAssembly[]& notCompiledTargetAssemblies, System.String[]& notCompiledScripts) (at C:/buildslave/unity/build/Editor/Mono/Scripting/ScriptCompilation/EditorCompilation.cs:1210)
UnityEditor.Scripting.ScriptCompilation.EditorCompilation.CompileScripts (UnityEditor.Scripting.ScriptCompilation.EditorScriptCompilationOptions options, UnityEditor.BuildTargetGroup platformGroup, UnityEditor.BuildTarget platform) (at C:/buildslave/unity/build/Editor/Mono/Scripting/ScriptCompilation/EditorCompilation.cs:1102)
UnityEditor.Scripting.ScriptCompilation.EditorCompilationInterface+<CompileScripts>c__AnonStorey3.<>m__0 () (at C:/buildslave/unity/build/Editor/Mono/Scripting/ScriptCompilation/EditorCompilationInterface.cs:288)
UnityEditor.Scripting.ScriptCompilation.EditorCompilationInterface.EmitExceptionAsError[T] (System.Func`1[TResult] func, T returnValue) (at C:/buildslave/unity/build/Editor/Mono/Scripting/ScriptCompilation/EditorCompilationInterface.cs:97)
UnityEditor.Scripting.ScriptCompilation.EditorCompilationInterface:CompileScripts(EditorScriptCompilationOptions, BuildTargetGroup, BuildTarget)

 

What happens if you right click the Unity.exe and choose "Run as Admin"? Same error?

 

Yes same error

 

Try finding this file in your file explorer: C:\Program Files\Unity\Editor\Data\Tools\RoslynScripts\unity_csc.bat

Next, right click the file, and select "Open With". Choose a text editor to open it, as double clicking a bat file will try to execute the script by default.

See if you manually navigating to the file results in the same/similar access denied error. Sometimes, access denied errors can even occur when the file simply doesn't exist, so it's good to make sure it even exists.

If you do not receive the error, try to change the file permissions on the top level folder "C:\Program Files\Unity\" to allow read/write for everyone, and not just admin. Choose to cascade these changes to all child folders and files. Then, try all of this again and see if it still errs.

 

I tried to grant everyone full access and I can definitely edit the unity_csc.bat file now and save it, however unity is still complaining:
Win32Exception: ApplicationName='C:\Program Files\Unity 2019.3.0a3\Editor\Data\Tools\RoslynScripts\unity_csc.bat', CommandLine='/noconfig @temp/UnityTempFile-2f8d3f5f0c51ba547a3710b9bb4c5d70', CurrentDirectory='', Native error= Access is denied.


When I add a new "C#" script and try and attach it to a gameobject it crashes saying that the script class name cannot be found.

I am 100% sure that the class name for example MyScript matches the file name MyScript ...

 

So the latter issue will occur when your Unity fails to make a .meta file version of your newly created .cs script. It sounds like there is something is fundamentally messed up with your Unity. You may want to try reinstalling it entirely, or try a different version. I don't know what else could be going wrong here, but this isn't normal.

 

I think I have figured it out, I am using COMODO anti virus, and after disabling the COMODO internet helper service it is working ... I remember having an issues with BLENDER and turning off the COMODO internet helper server that issues was also fixed, but I have turned it on since then because I no longer play with BLENDER.

 

Can you confirm that this is truly what is messing up Unity as well? Using an anti virus app such as COMODO?
Surely Unity is signed and properly developed??

 

It does not need to be a signing issue. Last year, I and other encountered an issue with Nord VPN that caused Unity to load into a blank grey screen with no content. Another issue in Nord VPN caused a SIGTERM error where the vpn service and Unity tried to simultaneously access a single address in memory, resulting in a crash. The issue seemed to be around security features in the service.

So VPN's and Antivirus applications do a lot of things that can potentially interfere with applications. A game engine puts its fingers into a WHOLE lot of pies in a computer. Things that a normal application would never ever need to touch. This raises red flags for antiviruses which reasonably interpret this access as being a virus or malware.

The options are to report to your antivirus that Unity is a legitimate application, and they should whitelist it so that their application stops interfering. Or alternatively, simply turn off the software that is interfering.

 

Hi, thank you for your reply. At least I found the cause and I can carry on playing with Unity!

 

hey i am also having the same problem i can't fix it please help

 

i have no antivirus enable

 

Guys how do you fix the problem. İ am get crazy from this problem reinstall 3, 4 version of Unity.

 

any updates ? i stoped my antivirus but still the same problem

 

Same issue, tried reinstalling Unity 3-4 times but doesn't work. I think it is not about Unity but about csharp or other things. But couldn't find a solution. Drove me nuts

 

anyone find a solution?

 

there is no solution to this i guess... it just wont fix having same issue and it just wont fix

 

do all the things, INSTALL UNITY HUB AS RUN ADMIN & INSTALL AGAIN AND AGAIN BUT STILL NOTHING HAPPEN..... EMAIL THAT ISSUE BUT TO UNITY BUT STILL NO SOLUTION...

 

Have you tried launching the hub/editor as admin, not just the install? Access Denied errors are usually user related (lack of access rights for the user).

 

it works with unity 2018 with me

 

If there is nothing wrong with the path of csc.exe written in "unity_csc.bat", it is not a direct cause.

In this case, most of the errors occur because the compilation was not completed in other parts.

If you have reinstalled the editor, check to see if all the packages which were in original project have imported from the Package Manager, and see if there is a compilation error in the script you have written.

Even if the manifast.json file contains information about the package, it is considered unimported unless the package manager within the editor has a green checkmark.

This is often what happens when compilation errors occur.

 

Hi there, still getting this error after multiple reinstalls of editor and hub and changing access settings in the program files location of the editor.
I have tried uninstalling hub and running Unity from cmd shell but to no avail either.
I have also checked and double checked the unity_csc.bat file.

I am using 2019.4.19f1 and have been blocked on a project for a week now.

Is anyone experiencing issues with this version in particular?

Please advise

 

I am using 2020.2.3f1, but the problem occurred very often, so I tried many solutions.

The most effective thing was to open the package manager, delete the URP package and import it again.

In addition, I intentionally caused a compilation error in my script, then corrected it again and repeatedly made the editor recompile the script. At this time, when I got error messages on the console saying that I couldn't find the namespace of the package I was using in the script, I deleted the packages and repeatedly imported them again.

 

I have tried various versions such as 2020.2, 2020.1, 2019.4, but most of them have been solved by this way.

Considering that the same problem occurred even after re-installing both the Unity Hub and the editor, there seems to be a cause of a crash among package managers or packages.

 

Okay, I figured out the cause of this problem. My guess is wrong and what I wrote above is just a temporary measure.

My cause was an anti-virus program installed on my computer. After removing this program, the problem was solved.

In addition, the same problem did not occur after recompilation was attempted in the method described above to solve the project that still had problems.

 

I don't have any antivirus software on my computer other than windows defender and I'm still running into the same issue. Even new unity projects have the same issue. Do you have any idea what else I should try? I tried disabling windows defender but still had the same problem. I'm using Unity 2019.4.21f1 if that helps. This bug has been keeping me from working on a class project for the past week and any help would be super appreciated. Thank you!

 

Go into your task manager and gradually kill all non-critical processes. Start with non-Windows processes (like from apps you downloaded). After each one, launch Unity. By process of elimination, you will eventually find the process that is interfering with Unity. It doesn't have to be an anti-virus for this issue to occur, but it just seems like anti-viruses were putting their fingers in the right pie to interfere with Unity.

 

I've gone through and killed basically every process I can and I'm still getting the error, unfortunately. I've attached a screenshot of all the processes I have left. Most of them are either windows processes or can't be killed. Do I have any other options left? Is there a way to directly contact unity support? This error is pretty frustrating. Thank you for your help!
EDIT: I'll also mention that I've tried installing Unity on a separate drive and that didn't fix the issue either.
EDIT2: Ok so it turns out that my error is slightly different than the one this post is for Mine says:
Win32Exception: ApplicationName='R:\RemotePrograms\Unity\Editor\Data\Tools\RoslynScripts\unity_csc.bat', CommandLine='/noconfig @temp/UnityTempFile-516b4a37a94697b49b51d9e1e7eb4aa2', CurrentDirectory='', Native error= The system cannot find the file specified.
It says "The system cannot find the file specified" instead of permission denied. That might be why the solutions from this post aren't working.

 

Can someone help here I have the same issues for weeks, tried everything

 

same error and no help from support. just built this PC with a 3080 and an i9900k this company is trash and there support sucks even more.

 

If you're getting "access denied", that would normally be a user permissions issue, which Unity doesn't have any control over. Try to just run that batch file manually from a command prompt and see what happens.

If the issue is instead "The system cannot find the file specified", first verify that the file exists. The last thread I helped with that had that error it ended up being a problem with their Windows install, where "cmd" (command prompt application) would fail to start. "cmd" is what Windows uses to execute batch files, since batch files are essentially just scripts for cmd. So I'd check that. If your problem is Windows related, again that isn't something Unity can fix.

 

I've experienced the same problem and solved. Some security program blocked it.
In my case it was virtual screen capture protection program.
Uninstalled it and recompiled unity, it worked fine.
And then reinstalled that security program, both worked fine.

Try to find the similar candidate security programs and uninstall it.

 

Process Lasso also affects this. Disabled and removed and fixes FYI

 

Try to discover what the editor tried to do and was denied, and do this manually for it. I did it and worked for me. My editor tried to delete some parts of something calld Bee functions, I went there and deleted the whole directory called Bee, inside the project's directory, when I open the project the error were no more there.

 

I have just installed 2021.3.22f1 and the URP shader disappeared from the project and the Win32 error appeared stating it could not find a file in the Bee folder. Doing your fix worked, thank you.