This message usually means that the files cannot be written to the specified location. Check that you have both read and write permissions for the drive and folder that you are trying to write to.
Doesn't seem to be the problem. Permissions ok. Can copy or move from the cards to the specified directories. Any other ideas? Thanks.
Jim is correct. This is very likely a permissions problem. If you have checked and are CERTAIN the permissions are correct you should, in this order:
2.Reset your preference file by holding down [Shift][Opt] and Launching Lightroom.