I removed a header in a table of contents and recreated it. I've assigned it the correct style, but my table of contents still shows "Error..bookmark not defined'. When I try to update the TOC, content from the document shows up in the TOC. Not the result I need. Can someone help me?

Not sure what you are doing. There should not be bookmarks in a TOC.
Here are some references that might help.

• Generating a Table of Contents
• How to create a table of contents in Microsoft Word by Shauna Kelly
• TOC Tips and Tricks by Suzanne Barnhill, MVP

If you think you have the basics down, try the third link first.

I already answered that, in detail at: Need help with TOC in word 2010 - Microsoft Community
If you're going to cross-post, kindly observe the cross-posting etiquette: Excelguru Help Site - A message to forum cross posters

__________________
Cheers,
Paul Edstein
[Fmr MS MVP - Word]