got rid of "others" but now I have more syncing problems
The -54 error is defined as follows : Software lock on file; Not a subscriber

Is your computer Authorized ? iTunes -> Store -> Authorize this computer ?

Otherwise you don't have the correct permissions to a file you are trying to use for the sync. Try running the following script to see if it helps. It will unlock all files in your ~/Music folder.

tell application "Finder"
set locked of every item of entire contents of folder "Music:iTunes" of home to false
end tell


Reference here