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Sorry you're stuck but there's almost always a pretty easy fix! Do NOT try to start all over again, uninstall Max's Pitch Package, etc. That can make it worse. There's a 95% chance the same snag/fix is listed & answered in the Help FAQ. But if you can't find it there, post your problem here.
Make sure you post in the right category below & be sure to include a screencap showing the issue!
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Ok, so looking at your screencap, I can see you are trying to import the Pitch record data into the Meeting object - you told it the wrong file. You told it to use MaxzPitchDataFile which was from Lab 1b. You were supposed to tell it to use MaxzMeetingDataFile.
But it will not work anyway because your Meeting object doesn't have the fields that you are supposed to import data to: Meeting Date, Comments, Contact Name Mobile, and Email. They are not in your Meeting object. You were supposed to add them to Meeting in Lab 2a, Steps 74-79. Go to Setup > Object Manager > Meeting and then Fields & Relationships and do Steps 74-79 from Lab 2a. Then when you go back to Lab 2b and try the steps to import, make sure you tell it to use MaxzMeetingDataFile and it will work.