Drupal Nag

“Cannot create a Drupal user account for user 101010. The email address specified for 101010 in the IPB forum account (jordistolemybike@starfleet.com) is already registered to another user in Drupal. This should not happen. Most likely both accounts are yours. Please delete your Drupal account, change your email address in IPB or contact your administrator.”

is this because I registered a different account?