[PLUG-TALK] What does 'cannot stat' error message mean with cp command?

[John Jason Jordan]

I have a 1TB USB drive with folders MP3s/Symphonic, which is empty. I
also have another Thunderbolt 3 32TB drive mounted at
/media/jjj/Movies, which contains a folder MP3s, which contains 1300
.mp3 files. I want to copy the 1300 files to the empty folder.

The 1.1 TB drive is mounted at /media/jjj/2040-6DEA and is formatted
ExFAT. The TB3 drive is mounted at /media/jjj/Movies and is formatted
ext4.

The command I used is: cp /media/jjj/Movies/MP3s/*.mp3
/media/jjj/2040-6DEA/MP3s/Symphonic/

Which resulted in 1300 error messages like this:

cp: cannot stat '/media/jjj/2040-6DEA/MP3s/Symphonic/Weinberger -
Schwanda the Bagpiper, Polka and Fugue.mp3': Input/output error

I don't get it.