Mac OS X Lion: Error Code -50

I had all of my iTunes files on a NAS (WD MyWorld Book - White Light Edition). The NAS was basically taken over by TimeMachine, so I copied all of my data onto an external LaCie drive which is Mac OS Extended (Journaled). Copying from the NAS to the LaCie worked just fine. I reset the NAS so it was blank and recaptured the 900GB TimeMachine had eaten up.

Next I tried to copy the files from my external LaCie back to the NAS and got the error: “The operation can’t be completed because an unexpected error occurred (error code -50).”

When I copy the files from the LaCie to my MAC HD, it works just fine. When I try to from my Mac HD, the same error occurs. I should say “folders” not “files” because I can move individual files.

My NAS is configured for AFP, NFS, and CIFS. It worked fine, of course, prior to resetting it. Now it won’t allow me to move files to it. There are some apparent “solutions” but they haven’t worked for me.

I’m not sure what to do at this point.

What if you use TM itself to copy the files back and forth?