This is my cheat sheet if I have to look back for an answer for problems. You're welcome to add or comment the answer.
Monday, September 27, 2010
Questionnaire Export CSV Issue
You're trying to export questionnaire responses to csv format and there are missing response on one or more columns. Check the question name for that missing column and rename it with something else. It's probably a general name such as ID or Full name that interfere with the moodle general field name.