Retroarch games not booting?

So, all this time with my SNES Mini, and hacking it, I've never once delved into the depths of Retroarch, due solely only to me feeling it was unnessecary. Now, I've seen KMDF's Game Boy DMG Shader, so I decided to install it, to try that out, as I feel it is the best way to emulate that particular facet of the original Game Boy. However, I think I've done everything I need to, but I'm still running into issues.

I already had a custom boxart and save compression mod installed. Then I installed _km_retroarch_171_3_10_18. Afterwards, I installed these hmods: _km_gambatte_2_23_18 _km_retroarch_shaders_add-on_3_10_18

Then, I added Metroid 2 into my games, and put ' --retroarch' at the end of its command line.

Is there something else I need to do still? When I select the game, the screen goes black for a few seconds, and takes me to the menu of games again. Any help is appreciated!

r/MDFMKanic , can you help?