Studio - Activities - Unable to start execution error

Installed Studio and when I run a default generated activity, I get an error:

“Unable to start execution” - Cannot create and populate list type System.Collections.Generic.IReadOnly Collection…Path 'JobModel.ReferencedAssemblies", line 1, position 436

Also detailed errors in logs:

  • Studio.log
    18:53:46.6384 => [ERROR] [UiPath.Studio.exe] [1] System.AggregateException: One or more errors occurred. —> Newtonsoft.Json.JsonSerializationException: Cannot create and populate list type System.Collections.Generic.IReadOnlyCollection`1[UiPath.Models.NuGetFeed]. Path ‘’, line 1, position 1.
    at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateNewList(JsonReader reader, JsonArrayContract contract, Boolean& createdFromNonDefaultCreator)

18:54:13.5489 Error System.IO.FileLoadException: API restriction: The assembly ‘file:///C:\Users\smarginean\AppData\Local\UiPath\app-19.10.0-beta0252\Rules\es\Microsoft.Expression.Prototyping.Interactivity.resources.dll’ has already loaded from a different location. It cannot be loaded from a new location within the same appdomain.
at System.Reflection.RuntimeAssembly._nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, RuntimeAssembly locationHint, StackCrawlMark& stackMark, IntPtr pPrivHostBinder, Boolean throwOnFileNotFound, Boolean forIntrospection, Boolean suppressSecurityChecks)

Thanks, Sebastian.

Welcome to uipath community
kindly have a view on this thread

Cheers @Sebastian_Marginean