OL Learn

W3001 : Error while executing plugin: HTTP/1.1 500 ApplicationException: InvalidAccessError: A parameter or an operation is not supported by the underlying object

Hello,

I want to send emails through the Create Email Content Workflow Plugin. That worked fine for a while but now I get an error.

W3001 : Error while executing plugin: HTTP/1.1 500 ApplicationException: InvalidAccessError: A parameter or an operation is not supported by the underlying object.

Does anyone know what this error means in detail?
I restarted the server and everything works fine for some time. But after a while (I do not know if it happens after a time period or an amount of executions) the same error occurs permanently until I restart the server again.