Can you help me with this error?

Calling hook OnEntityTakeDamage resulted in a conflict between the following plugins: AmusementRides - False (Boolean), NoDecay (True (Boolean))

This isn't really an error, just a warning that two plugins are returning different values from a hook. This is safe to ignore since they are both returning non-null values overriding the default behaviour. If you want to solve this warning you can update AmusementRides to return true instead of false in the OnEntityTakeDamage method.