502 Command 'MDTM' not implemented

I keep getting this return when trying to upload and overwrite a file on my website:

502 Command 'MDTM' not implemented
[20:55:10] STAT paoevent.html

The program just keeps trying without any success.

Any suggestions?

Please post the log from the transfer queue. To get it double click the file in the transfer queue. If there is no file in the transfer queue the transfer was successful.