There's something wrong with your bitcoin.conf file:
Go to your /Users/<YOUR USER HERE>/Library/Application\ Support/Bitcoin folder.
Right-click on bitcoin.conf.
Choose "Open with", "Other", and select TextEdit from your Applications.
It should look like:
rpcuser=user
rpcpassword=password
If it doesn't look like the above, fix it and save it. It would appear you used an " - " instead of an " = ".