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What does this error message mean?

Posted previously today about a FeatureScript I am working on for some learning/practice. I made some progress after getting stuck on a small miss of coding, but now I have this error:
The first mate connector stops working, and the second one is fine using the same format.
Tagged:
0
Answers
It would appear that, at this point in the code,
MC
is equal toundefined
.