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i try to import phpnuke+phpbb 2 forum to vbulletin 4

when i check and update database display this error :

Quote:
Altering tables

ImpEx will now Alter the tables in the vB database to include import id numbers. This is needed during the import process for maintaining references between the tables during an import. If you have large tables (i.e. lots of posts) this can take some time. They will also be left after the import if you need to link back to the original vB userid.
moderator - importmoderatorid Completed
usergroup - importusergroupid Completed
ranks - importrankid Completed
poll - importpollid Completed
forum - importforumid Completed
forum - importcategoryid Completed
user - importuserid Completed
style - importstyleid Completed
thread - importthreadid Completed
post - importthreadid Completed
thread - importforumid Completed
smilie - importsmilieid Completed
pmtext - importpmid Completed
avatar - importavatarid Completed
customavatar - importcustomavatarid Completed
customprofilepic - importcustomprofilepicid Completed
post - importpostid Completed
attachment - importattachmentid Completed
pm - importpmid Completed
usernote - importusernoteid Completed
phrase - importphraseid Completed
subscription - importsubscriptionid Completed
subscriptionlog - importsubscriptionlogid CompletedTesting source against : phpBB2 ::2.0.22

Valid found tables :

Possibly custom tables or incorrect prefix :

attachments NOT found.
attachments_desc NOT found.
auth_access NOT found.
banlist NOT found.
categories NOT found.
config NOT found.
confirm NOT found.
disallow NOT found.
forum_prune NOT found.
forums NOT found.
groups NOT found.
posts NOT found.
posts_text NOT found.
privmsgs NOT found.
privmsgs_text NOT found.
ranks NOT found.
search_results NOT found.
search_wordlist NOT found.
search_wordmatch NOT found.
sessions NOT found.
smilies NOT found.
themes NOT found.
themes_name NOT found.
topics NOT found.
topics_watch NOT found.
user_group NOT found.
users NOT found.
vote_desc NOT found.
vote_results NOT found.
vote_voters NOT found.
words NOT found.

If you have all red tables, i.e. none correct this could possible be your table prefix :

nuke_bb
Failed Check database permissions and connection, or table prefix to ensure its correct

how i can solve this problem ?