It could be error message cause the file path was not entered (selected). Please verify this situation and the trouble could be shoot.

Other Topics
What errors could be during rename actions on read-only drives?
Where can I download mp3 rename software?
Why your Mp3 ID3v1v2 Tag Edit & Sort Tool is too small?
What for the "Found" panel in the Mp3 ID3v1v2 Tag Edit & Sort Tool?