Unable to get System.Runtime dependency to install properly

I’m using Studio to invoke C# code in a sequence. It’s been working fine for almost a year in my project. However, yesterday I opened the project and the following error occurred when invoking the code:

Invoke code: No compiled code to run
error CS0012: The type ‘System.Attribute’ is defined in an assembly that is not referenced. You must add a reference to assembly ‘System.Runtime, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a’. At line -34

I’ve been through all of the forums and tried the following:

  • Uninstalling/Reinstalling Studio
  • Removing all packages and caches and then updating packages.
  • Moving my package installation directory to “C:\Program Files (x86)\UiPath\Studio\packages”

However, none of these have fixed the issue. I cannot attach my log, but here the tail of it:

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].
, HResult -2147024894
21:28:14.8000 => [ERROR] [UiPath.Studio.exe] [26] $LoadAssembly: Microsoft.Exchange.WebServices.Auth, Version=15.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35: System.IO.FileNotFoundException: Could not load file or assembly ‘Microsoft.IdentityModel, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35’ or one of its dependencies. The system cannot find the file specified.
File name: ‘Microsoft.IdentityModel, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35’
at System.Signature.GetSignature(Void* pCorSig, Int32 cCorSig, RuntimeFieldHandleInternal fieldHandle, IRuntimeMethodInfo methodHandle, RuntimeType declaringType)
at System.Reflection.RuntimePropertyInfo.get_Signature()
at System.Reflection.RuntimePropertyInfo.get_PropertyType()
at ActiproSoftware.Text.Languages.DotNet.Reflection.Implementation.BinaryAssemblyLoader.#aFc(#Lrc #wAf, MemberInfo #xAf)
at ActiproSoftware.Text.Languages.DotNet.Reflection.Implementation.BinaryAssemblyLoader.#cFc(#hsc #4Ub, Type #uAf)
at ActiproSoftware.Text.Languages.DotNet.Reflection.Implementation.BinaryAssemblyLoader.#XEc(Assembly #sxc)
at ActiproSoftware.Text.Languages.DotNet.Reflection.Implementation.BinaryAssemblyLoader.#iFc(Assembly #sxc)
at ActiproSoftware.Text.Languages.DotNet.Reflection.Implementation.AssemblyRepositoryBase.#30j(Assembly #sxc, IAssemblyName #4tc, IBinaryAssemblyMetadata #RDb)
at ActiproSoftware.Text.Languages.DotNet.Reflection.Implementation.AssemblyRepositoryBase.Create(Assembly assembly, IAssemblyName assemblyName, IBinaryAssemblyMetadata metadata)
at ActiproSoftware.Text.Languages.DotNet.Reflection.Implementation.FileBasedAssemblyRepository.Create(Assembly assembly, IAssemblyName assemblyName, IBinaryAssemblyMetadata metadata)
at ActiproSoftware.Text.Languages.DotNet.Reflection.Implementation.FileBasedAssemblyRepository.GetOrCreate(Assembly assembly, IAssemblyName assemblyName, String location)
at ActiproSoftware.Text.Languages.DotNet.Reflection.Implementation.AssemblyRepositoryBase.#uBh(Assembly #sxc, IAssemblyName #4tc, String #bVe)
at ActiproSoftware.Text.Languages.DotNet.Reflection.Implementation.AssemblyRepositoryBase.Load(Assembly assembly, IAssemblyName assemblyName)
at ActiproSoftware.Text.Languages.DotNet.Reflection.Implementation.AssemblyRepositoryBase.Load(String fullName)
at UiPath.Studio.Plugin.Workflow.ExpressionEditor.SyntaxService.LoadAssembly(LoadIntellisenseAssembliesContext context, String assemblyName, CancellationToken cancellationToken)

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].
, HResult -2147024894
21:28:14.8130 => [ERROR] [UiPath.Studio.exe] [26] $LoadAssembly: Microsoft.Exchange.WebServices.Auth, Version=15.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35: System.IO.FileNotFoundException: Could not load file or assembly ‘Microsoft.IdentityModel, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35’ or one of its dependencies. The system cannot find the file specified.
File name: ‘Microsoft.IdentityModel, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35’
at System.Signature.GetSignature(Void* pCorSig, Int32 cCorSig, RuntimeFieldHandleInternal fieldHandle, IRuntimeMethodInfo methodHandle, RuntimeType declaringType)
at System.Reflection.RuntimePropertyInfo.get_Signature()
at System.Reflection.RuntimePropertyInfo.get_PropertyType()
at ActiproSoftware.Text.Languages.DotNet.Reflection.Implementation.BinaryAssemblyLoader.#aFc(#Lrc #wAf, MemberInfo #xAf)
at ActiproSoftware.Text.Languages.DotNet.Reflection.Implementation.BinaryAssemblyLoader.#cFc(#hsc #4Ub, Type #uAf)
at ActiproSoftware.Text.Languages.DotNet.Reflection.Implementation.BinaryAssemblyLoader.#XEc(Assembly #sxc)
at ActiproSoftware.Text.Languages.DotNet.Reflection.Implementation.BinaryAssemblyLoader.#iFc(Assembly #sxc)
at ActiproSoftware.Text.Languages.DotNet.Reflection.Implementation.AssemblyRepositoryBase.#30j(Assembly #sxc, IAssemblyName #4tc, IBinaryAssemblyMetadata #RDb)
at ActiproSoftware.Text.Languages.DotNet.Reflection.Implementation.AssemblyRepositoryBase.Create(Assembly assembly, IAssemblyName assemblyName, IBinaryAssemblyMetadata metadata)
at ActiproSoftware.Text.Languages.DotNet.Reflection.Implementation.FileBasedAssemblyRepository.Create(Assembly assembly, IAssemblyName assemblyName, IBinaryAssemblyMetadata metadata)
at ActiproSoftware.Text.Languages.DotNet.Reflection.Implementation.FileBasedAssemblyRepository.GetOrCreate(Assembly assembly, IAssemblyName assemblyName, String location)
at ActiproSoftware.Text.Languages.DotNet.Reflection.Implementation.AssemblyRepositoryBase.#uBh(Assembly #sxc, IAssemblyName #4tc, String #bVe)
at ActiproSoftware.Text.Languages.DotNet.Reflection.Implementation.AssemblyRepositoryBase.Load(Assembly assembly, IAssemblyName assemblyName)
at ActiproSoftware.Text.Languages.DotNet.Reflection.Implementation.AssemblyRepositoryBase.Load(String fullName)
at UiPath.Studio.Plugin.Workflow.ExpressionEditor.SyntaxService.LoadAssembly(LoadIntellisenseAssembliesContext context, String assemblyName, CancellationToken cancellationToken)

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].
, HResult -2147024894
21:33:40.8898 => [ERROR] [UiPath.Studio.App.Logging.OutputLogger] [10] Invoke code: No compiled code to run
error CS0012: The type ‘System.Attribute’ is defined in an assembly that is not referenced. You must add a reference to assembly ‘System.Runtime, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a’. At line -34

Hello @alex-m!

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Hi @alex-m,
Apart from this error do you see any exclamation marks on activities or something like this?