A Internal Error has Occured - Whenever Attempting to run in Debug Mode

Hi Team,

Machine Info :
Studio Pro 2021.4.3 - 5/10/2021
Community License
EXE Installer

License Provider: Internal
Activation ID: UIP-16f97bcb3e
Update Channel: Preview
Microsoft Windows 10 Home Single Language 64-bit

Issue 1
Whenever I am trying to Run a Automation in Debug Mode - I am Getting the below Error . Even After Multiple Restart and Reinstall of Studio, Same Error.

Issue 2
If I choose to Click Later - Then it Works , However the Output Panel is Missing. The Automation Runs Proper in Run Mode.


An internal error has occurred. It is recommended to restart UiPath Studio.

Error: System.ArgumentException: Cannot dock to the side of an auto-hide target. (Parameter ‘target’)
at ActiproSoftware.Windows.Controls.Docking.ToolWindow.Dock(IDockTarget target, Side side)
at UiPath.Studio.Shell.Views.MainWindow.EnsureToolWindowIsInVisualTree(IToolWindow tool)
at UiPath.Studio.Shell.Views.MainWindow.EnsureAllToolWindowsAreInTheVisualTree()
at UiPath.Studio.Shell.Views.MainWindow.<>c__DisplayClass51_0.b__0()
at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler), HResult -2147024809


Hello @mukeshkala!

It seems that you have trouble getting an answer to your question in the first 24 hours.
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Hi @mukeshkala

Could you maybe send me the output from the
via a PM?

Also, a does it also happen on a new project?

Hi @mukeshkala, also, apart from the DiagTool report, it would be really helpful to know the following details:

  • are you using Windows with a Windows Display Language that is different than English? If yes, can you please specify which one?
  • could you please show us a screenshot of how Studio looks before running the project in Debug mode? it would be interesting to know where the Output panel is present and if it is pinned or not.
    Thank you very much!

Hi @loginerror @coramia ,

Thank you for the response.

The Windows Display Message is Set to English , The Output panel is available before Debug - Even if i Pin it , During Debugging the Panel in Not available , Once the Execution is completed , then it is visible…

**The Issue is Resolved now - What I Did **

  1. Uninstalled Uipath Studio.
  2. Deleted %Temp%
  3. Deleted %AppData%
  4. Deleted UiPath Folder from %Roaming% and %Local%
  5. Restarted Machine
  6. Reinstalled Studio .

Prior to this , I was Directly installing without cleaning up the mentioned folder.



Hello @mukeshkala , Though I am late for revert to your Issue but this can help other, so to resolve your issue , we can click on Home>Settings>General>Reset Settings.

This will reset your setting to default and erase you current setting, including documents, application layout, default language and many others. Some changes may apply on your next application launch.


Thanks This works! @Pranav

Works fine!