Please, do no ask unrelated questions. The topic of this thread is:
Which doesn't mean anything, so stop adding more questions here. Create a different topic with a more descriptive name.
PS: the error that you are getting means that the Process file contains something wrong, and based on the description of the problem, you are probably missing a return statement in one of the Gateway conditions i.e.:
return (average > 50);
instead of:
(average > 50);