Describe the bug
The game crashes when tring to launch the game with the mod installed, it may be a compatability issue

Desktop:

• OS: WIndows 11
• Modpack: Self made
• Modpack Version: n/a
• Mekanism Version: CE 9.10.7
• Forge Version: 7.10.99.99

Here is a crashlog:
crash-2021-09-01_12.52.29-client.txt

Install codechickenlib and multipart and it should work. 1.7.10 is so old that the links forge use nolonger work to download dependencies

you can get multipart here: https://www.curseforge.com/minecraft/mc-mods/forge-multi-part

you can get multipart here: https://www.curseforge.com/minecraft/mc-mods/forge-multi-part

Yep, instaling last version of multipart solved it, case closed holmes