If you're constantly seeing these error message:
'Error happened in MIS communication, this could be while connecting, sending, receiving or parsing request/response. Please see logs for more details'
'Person class: GENERIC
Fileplan URL unavailable as Wisdom cannot be contacted. Error happened in MIS communication, this could be while connecting, sending, receiving or parsing request/response. Please see the logs for more details.'
You might need to restart both the MIS server and the Prod app server to refresh the system and fix this.
If it's only happening when you're trying to upload certain file types or sizes, it could be the attachment itself. Try uploading again, and that should fix the issue.