When I try reassigning the task to a different SharePoint workflow, it gets suspended with following error message:

> 
> 272a70cf-3e68-ab2c-0000-000000000000.  
> 
>  Details: An unhandled exception
>  occurred during the execution of the workflow instance. Exception
>  details: System.FormatException: Input string was not in a correct
>  format. at
>  Microsoft.Activities.Hosting.Runtime.Subroutine.SubroutineChild.Execute(CodeActivityContext
>  context) at
>  System.Activities.CodeActivity.InternalExecute(ActivityInstance
>  instance, ActivityExecutor executor, BookmarkManager bookmarkManager)
>  at
>  System.Activities.Runtime.ActivityExecutor.ExecuteActivityWorkItem.ExecuteBody(ActivityExecutor
>  executor, BookmarkManager bookmarkManager, Location resultLocation)
> 
> 
> 

Do you know why this happens?