Are you using the Pandora Desktop App for Windows / MAC?
Could you send over a screenshot of the exact error message you're seeing? I've included instructions below.
If you have a Windows machine please try using theSnipping Tool. You can find specifics about this tool and how to use ithere. Then attach that file in your next post.
If you have a Mac:
Hold down the Shift key and the Command key (which may have an Apple logo and/or a 'four-leaf clover' type symbol). Then, while still holding down these keys, press the3 key. This will save the screenshot as a file on your desktop. If you hit the4 key instead, it will give you a target allowing you to drag a box around only the item that you want to take a screenshot of.