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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Before you post make sure you check the Help FAQ for an instant solution first. Then, if you can't find it there, you can post your problem here and we'll get to it ASAP (within 24 hours), but be sure you:
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post in the right category
INCLUDE AT LEAST ONE SCREENCAP IN YOUR POST TO SHOW THE PROBLEM!!!!!!!!
explain the problem clearly
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.
Does your Expected Value report have extra columns in it besides Expected Value?