Try uninstalling mc and installing it again, or if you are using a profile/ launcher that uses a mod such as shaders or optifine you may need to uninstall that mod or just take it out of the mod folder.
Try uninstalling mc and installing it again, or if you are using a profile/ launcher that uses a mod such as shaders or optifine you may need to uninstall that mod or just take it out of the mod folder.