Ok, I accessed your account and I saw your Meeting object doesn't have any fields except Meeting ID. It's supposed to have other fields that you added in Lab 2a, Steps 65-79. You need to do those steps to add all those fields to Meeting. Then continue with Lab 2a, but in Step 93, where it says P-012, for you it is P-013. Also, in Step 112, for you it is P-013 instead of P-012 (because you deleted Pitch P-012 and it is gone now).
Then you can start Lab 2b and it will work this time, ok?
Ok, I accessed your account and I saw your Meeting object doesn't have any fields except Meeting ID. It's supposed to have other fields that you added in Lab 2a, Steps 65-79. You need to do those steps to add all those fields to Meeting. Then continue with Lab 2a, but in Step 93, where it says P-012, for you it is P-013. Also, in Step 112, for you it is P-013 instead of P-012 (because you deleted Pitch P-012 and it is gone now).
Then you can start Lab 2b and it will work this time, ok?