Mod Manager crashes upon enabling certain mods

[TMGITA]

Describe the bug
I was trying to play the "Ultrakill megapack" for dm5 but upon activating the mod, the launcher instantly crashes
Expected behavior
the mod to be activated normally

Steps to reproduce

1. add a dmc5 modpack (i think it crashes with all modpacks)
2. enable the modpack
3. crash

Other mods

it doesn't seem like it, only modpacks

Output log
its on the manager, not the game

Save game
its on the manager, not the game

Screenshots
its on the manager, not the game

Environment

• OS: Windows 11
• 32/64 bits probably 64 bits

Game

• 64 bits
• DRM free
• Version idk