When Agent versions involved in a file transfer job do not match, transfers will complete but the job will display in a status of 'Active' indefinitely.
This can happen if the sending agent is Windows v11.2 and the destination agent is Linux v10.0.8.
When this happens the above error message can be seen in the agent log.
To/From Agent versions must match when doing a File Transfer.
Ensure that the Agents used in the file transfer are both on the same major version.