I have complete the lab2b and I have checked all the steps and they match the description from the document.
I do not know why it keeps saying that Can't find...
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
That is a known issue with the grader. It is listed in the Help FAQ at the top of the Lab 2b section. The link is on the cover page.
Let me know, ok?