Invalid Library Found

When I upload a sketch into my Uno R3 I get the following error message:

Invalid library found in C:\Users\Astrobirder\Documents\Arduino\libraries\sketch_sep07a: no headers files (.h) found in C:\Users\Astrobirder\Documents\Arduino\libraries\sketch_sep07a

The sketch program seems to run fine regardless. Just need to know how I can remediate the error.

The problem is that you have saved a sketch to the libraries folder. You should only ever put libraries in the C:\Users\Astrobirder\Documents\Arduino\libraries. Please move the C:\Users\Astrobirder\Documents\Arduino\libraries\sketch_sep07a folder to any other location on your computer, or if you don't have any use for that sketch, delete it.