Hello,
The error message is not very informative (and looks like not formatted properly as well...), but as this happens after file copy it's probably caused by setting file permissions. The target file system might not support unix-style permissions and report it in the form of Operation not permitted
error.
It's nothing really to worry about, if this is just permissions that can't be set. A better error message in this case is needed though :-) And I'll look into that, thanks.