This is an overrun warning about your text layer. It says that the text that is in the frame is longer than the frame area so some text will not print. Often this can be returns or spaces that you may not even know that you have in the text box but it could be the last song title or similar.
As long as it looks good in the PDF or on screen you should be OK. The text that is getting cut off may not be important to you.
If you want to get rid of the error you can just make the text box deeper until the warning goes away.
Note: Zoom in on your text to ensure that you are not losing any valuable information. While this is just a warning, you'll want to check it carefully, before placing your order.