“Edit Level” button on mediocre mapper just brings me back to settings

I am creating a beat saber custom map using Mediocre Mapper (the latest version). I have followed BennyDaBeasts tutorial on this which you can find here:

My problem is that whenever I go to click “edit level”, it doesn’t enter the level editor; it doesn’t throw any errors, but just loads for a very long time and puts me back where I was before. Because no errors were given, I have no idea what’s going on. It is a .ogg, converted using audacity in the same way shown in the video, so converting it again does not work. Any help would be much appreciated.

It turns out my cover image was named "cover.jpeg" instead of "cover.jpg". I switched it and was able to easily load into the editor.