After completing Lab 1b I went through the grading process and it showed I had to errors. I went back and corrected the errors using the steps provided. I went back to re-grade my work. Going through the process, it listed a grading error. I retried re-grading the work, and even redid all the corrections, but the same message appeared.
Sorry you're stuck but there's almost always a pretty easy fix! Do NOT try to start all over again, eg. uninstall Max's Pitch Package, etc. That can make things worse.
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