LinuxQuestions.org - Mysql Error: Duplicate entry '0' for key 1

I moved my MYBB forum to a new server. I imported the DB with phpmyadmin but am getting an error when trying to post a new thread (the forum displays correctly, and users can login fine).

The error is:

Code:

mySQL error: 1062

Duplicate entry '0' for key 1

Query: INSERT INTO mybb_threads (fid, subject, icon, uid, username, dateline, lastpost, lastposter, views, replies, visible) VALUES ('9', 'test', '0', '1', 'tta-admin', '1155781406', '1155781406', 'tta-admin', '0', '0', '1');

Note: tta-admin is my username

What can I do to fix this error? On the server im trying to import to, im running MySQL version 4 and phpMyAdmin 2.8.0.2.