Abby, the records won't import because each one has to find it's matching Pitch record that it goes with. But since you didn't do much of Lab 1b, you don't have the 10 Pitch records they they are looking for, so they all fail.

Also, the unmapped issue is due to you not adding the Email field when you created the Meeting object.

So the problem now is that you have one Pitch record that you created in Lab 2a and it's ID is P-002. That means that if you tried to import the Pitch records now, they would get ID's running from 003 to 012. Then they wouldn't match up with the Meeting records and when you tried to import the Meeting records some would import but connect to the wrong Pitch records and others would not import at all.

So the best thing to do at this point is to get a brand new fresh SF account and catch up to where you were as fast as possible. Email me at tim.hill@themaxlabsproject.com and I'll give you the instructions with the shortcuts and a promo code that you can use to avoid paying again for Max's Pitch Package.