How do I suppress the "a duplicate file name exists, or the file cannot be found" message?

[eax22]

When I move many files, sometimes the message "a duplicate file name exists, or the file
cannot be found" appears, even though I have added >nul. Is there a way of preventing that message from showing up, except making sure that there are no duplicate files and that files can be found?

[ShadowThief]

Error messages are on their own stream and need to be suppressed with

Code: Select all

2>nul