Cause
Usually this error appears when the task is using an FTP connection and the session for this connection expired.
Solution
Please, re-create your FTP connection (you don't need to delete the existing connection but just add it again which will overwrite the connection).
Once the FTP connection is re-created, validate that your task is still properly configured with the FTP connection and run the task again.
Note: You can find steps regarding how to create the FTP connection on the article Connecting to FTP.
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