If you get an error stating "Nothing to Cut" after importing an image, you would want to follow the steps provided.
Click on the object. There should be a button labeled "Vectorize" (See image below)
This will bring you to a window to select the amount of colors you need and/or want in your cut file. Once the image on the right looks how you want it click the "1. Trace" option.
This is going to create your cut path for the object. If you like the outcome click the "2. Accept" button.
You should now be able to send a file to the cutter without getting a "Nothing to Cut" Error.