Test Mode

For some reason when I run test mode, it appears like this, it shows nothing but a blank canvas.

https://preview.redd.it/kzsk6pezczfe1.png?width=2461&format=png&auto=webp&s=5f84366f01e4698692e2fbb35d28b15dbde6fbc9

Does anyone already had this problem? Do you may know how I can resolve this?