If resource packs or mods fail to load or cause your game to crash, you will need to uninstall and reinstall them one at a time to find which one is the cause.
If you know the order in which you installed them, you can uninstall them in reverse order of installation, testing after each uninstall. If you installed multiple resource packs/mods at a time, we recommend you use the first method.
Since resource packs and mods are not created by Mojang, we are not able to offer support for them. If you need further assistance, please contact the author of the mod or resource pack.
If this did not solve your issue, return to Minecraft Troubleshooting here.