FTB One can't add another mod

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New Member
Dec 3, 2022
As I said in the title, I can't add more mods to the FTB One modpack. When I add a mod in the mod folder, the game window launch but crashes a few seconds after.
For example, I wanted to add the Crafting Automat mod, but as other mods, the same problem occurs.
If you have any idea of where the problem comes from, please tell me :).