Failure to Install Packages

I’m using Studio 2019.1.0, Enterprise Edition.
Since today morning, every package installation is failing.

The error I’m getting is “Object reference not set to an instance of an object”. And this is happening for practically any package that I’m trying to install/update.

Error Log

Object reference not set to an instance of an object.

Error: System.NullReferenceException: Object reference not set to an instance of an object.
at UiPath.Studio.Shell.Packaging.PackagesLicensesValidator.d__4.MoveNext()
— End of stack trace from previous location where exception was thrown —
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at UiPath.Studio.Shell.Packaging.PackagesLicensesValidator.d__3.MoveNext()
— End of stack trace from previous location where exception was thrown —
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task task)
at UiPath.Studio.Shell.Packaging.PackageOperationBase.d__24.MoveNext()
— End of stack trace from previous location where exception was thrown —
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at UiPath.Studio.Shell.Packaging.PackageOperationBase.<>c__DisplayClass23_0.<b__0>d.MoveNext()
— End of stack trace from previous location where exception was thrown —
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at UiPath.Studio.Shell.Packaging.PackageOperationBase.d__23.MoveNext()
— End of stack trace from previous location where exception was thrown —
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at UiPath.Studio.Shell.Packaging.PackageOperationUpdate.d__3.MoveNext()
— End of stack trace from previous location where exception was thrown —
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at UiPath.Studio.Shell.Packaging.PackageService.<>c__DisplayClass32_0.<b__0>d.MoveNext()
— End of stack trace from previous location where exception was thrown —
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at UiPath.Studio.Shared.Utilities.WindowCommandsExtensions.d__3`1.MoveNext()
— End of stack trace from previous location where exception was thrown —
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at UiPath.PackageExplorer.UI.ViewModels.PackageExplorerViewModel.d__140.MoveNext(), HResult -2147467261

Hi @pm200496

Could you let us know if there were any changes to your environment since last time it was working?

These types of issues are often resolved by clearing these two folders:
%userprofile%\.nuget\packages
%userprofile%\AppData\Local\UiPath\.cache
(please keep a backup)

And reinstalling Studio.

3 Likes

Hi,
Thanks for the solution. It worked! And no, there were no changes to the environment that I noticed. It all happened in a jiffy.
What could be the reason behind this error?