theme uploading problems

whenever i try to upload a theme into SmartFTP, i always get this message for one file or another:

550 Can't check for file existence

is there someway to fix this, or what? when i thought it was uploaded correctly, i tried enabling it on my site, and now i can't go anywhere but the admin page. i also can't seem to figure out how to use the Global Queue. could someone explain in a lot of detail how to use it, to see if that works? any help is greatly appreciated

You can ignore it. Its not an error.

Regards,
-Mat