

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!
This is explained in the Help FAQ but the error says there is a mismatch between the column headers in the data file and the field names in your object. It's showing that your Meeting object is missing the Meeting Date field so there is no match - no where for that column of data from the file to go to inside Salesforce. If you created Meeting Date like you were supposed to, you probably misspelled it. Then just go to Setup > Object Manager > Meeting > Fields & Relationships and pick it and fix the spelling. Then the import will work
If it's there and spelled correctly, you probably went too fast when you created it and it's visibility never got turned on. You can check the Help FAQ and see how to turn it on. It's pretty easy. Then the import will work.