So I tested all of the mods in the latest experimental after updating the game using the launcher and they all worked with no errors. Now, a few things might be happening so let me list a few solutions.
1.) Download new versions of the mods and replace the ones you have in your mods folders. Make sure you delete them from your mod folder first and then place the new ones inside, donât put the new mods with the old ones still in the mod folder and use the replace file option windows gives you if you are using windows.
2.) Delete the mods from the mod folders, update the game again and then place them back.
3.) Delete your world if it is old and create a new one.
4.) Do a clean install. (Install the game into an empty folder and then manually add mods/texture packs/sound packs, etc.)