Gsuite Application Scope - Send Mail Message "invalid_grant"

Hi everyone, I’m facing this error when I try to send an email with “Send Mail Message” activity in Gsuite Application Scope.

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18.4.5+Branch.support/v2018.4.Sha.2a53a262e2c1098055c3ecbdabe73d45e0a6dc29

Source: Send Mail Message

Message: Upload failed after 0 bytes. Error:“invalid_grant”, Description:“Robot is missing a project number.”, Uri:""

Exception Type: System.ApplicationException

An ExceptionDetail, likely created by IncludeExceptionDetailInFaults=true, whose value is:
System.ApplicationException: Upload failed after 0 bytes. Error:“invalid_grant”, Description:“Robot is missing a project number.”, Uri:""
at UiPath.GSuite.Activities.SendEmail.d__39.MoveNext()
— End of stack trace from previous location where exception was thrown —
at UiPath.Shared.Activities.AsyncTaskCodeActivityImplementation.EndExecute(AsyncCodeActivityContext context, IAsyncResult result)
at UiPath.Shared.Activities.AsyncTaskCodeActivity.EndExecute(AsyncCodeActivityContext context, IAsyncResult result)
at System.Activities.AsyncCodeActivity.System.Activities.IAsyncCodeActivity.FinishExecution(AsyncCodeActivityContext context, IAsyncResult result)
at System.Activities.AsyncCodeActivity.CompleteAsyncCodeActivityData.CompleteAsyncCodeActivityWorkItem.Execute(ActivityExecutor executor, BookmarkManager bookmarkManager)
.
.

I don’t understand what could it be.

Thank you in advance for your help.

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