List Does Not Exist Error

Problem: So this was a weird one, after we upgraded from 2007 to 2010, several users were running into the 'List does not exist' error when browsing to specific areas of their sites.

Solution: The 'Sharepoint Server Publishing Infrastructure' Site Collection feature had to be activated (see steps below)

1. Site Actions >> Site Settings >> Site Collection Features
2. Do a Find for 'Sharepoint Server Publishing Infrastructure' and Activate
3. Tell the people whom you were having the problem that it took you 3 weeks to figure out and that you deserve a Belgian beer (recommend a Blonde for many reasons)