Here are some rules i have encounter that you most follow if changing anything in shootorial
some examples of common changing are:
1 all classes have capital starting-but yours dont.
2 the names are too large-but you simplified.
If you have done this changings you have to check that:
1 instance name cant be the same as class if not it wont work
2 you must change all copied files so they adjust to your classes
3 dont use symbols they may make a unvalid statement
4 always save all your things before testing movie if not it wont work
5 if you are sure it is right close it and open it again if it doesnt work you have done something wrong
This is all i have learned till shootorial 5 if someone has anything else post it please and i will update
