Need VBulletin problem

hi this is my problem in vb anybody can help me.. when im importing the mods this is the message of vbbulletin..please help this problem
A conflict was detected in the bitfields. You cannot continue with the installation of this product until this has been fixed. The conflicts found were:
    * Bitfield Collision: prefixrequired = credits_cantearn
Thanks and advance..
Answer #1
http://www.vbcredits.com/forum/showthread.php?t=2362