This eror means that you have a bad spelling in your variables that is all.

For example, i had this in my code:

            //'title'=> ['required','min:3','max:255'],


NOTICE the body element value is requied, but it should be required.
This is the full error I got and after I changed  requied to required, it worked.
Method Illuminate\Validation\Validator::validateRequied does not exist.
Bad Method Call
Did you mean Illuminate\Validation\Validator::validateRequired() ?
hope that help solve the answered.