Unable to create a "configuration"

[EDIT] I figured it out. It turns out when I was editing my CMake files, I commented out my source files and that was preventing it from working.

I'm trying to create a project for an ARM Cortex-M4 microcontroller. I'm having trouble selecting a "Configuration" int the "Run/Debug Configurations".

The dropdown for "Configuration" is empty. I've tried going to "File > Settings > Build, Execution, Deployment > CMake" and I can see Debug in the window. I can add a Release. It seems like sometimes I'm able to see those in the "Run/Debug Configurations" window, but I can't seem to get it to work at all now. At one point I got my project to compile and run on my microcontroller, but now I can't get anything to appear in the "Configuration" dropdown.

I've tried deleting and remaking the Debug configuration in the CMake menu, I've tired deleting and regenerating the cache folders, doing Invalidate Caches and Restart, and I can't seem to get it to work again.