Can't add new go url after upgrade from drupal 5 to Drupal 6

I have tried to upgrade my site from drupal 5 to drupal 6. One of my modules is go url redirect (gotwo).

But i can't add new go url redirect after upgraded.

When i saw phpmyadmin, last gid field contain zero value (0) not auto increment. this gid is first and last time i can added at drupal 6.