Merge from IPB to MyBB - users problem

Hello everybody, I'm merging from IPB to myBB, because the first engine is very very very very very bad....
I'm discovering MyBB and till now I'm very happy to making this choise.
I have upload 1,5GB of the old db (table prefix ibf_*) and now I'm running the merge.
I've solved just some little errors, but now the board flash me a message:

MyBB has experienced an internal SQL error and cannot continue.

SQL Error: 1054 - Unknown column 'aim' in 'field list' Query: INSERT INTO mybbf9_users (usergroup,additionalgroups,displaygroup,import_usergroup,import_additionalgroups,import_displaygroup,import_uid,username,password,salt,loginkey,email,regdate,lastactive,lastvisit,website,showsigs,signature,showavatars,timezone,avatardimensions,avatartype,avatar,lastpost,icq,aim,yahoo,skype,google,hideemail,allownotices,regip,lastip,language,passwordconvert,passwordconverttype,postnum,invisible,birthday,birthdayprivacy,subscriptionmethod,receivepms,receivefrombuddy,pmnotice,pmnotify,showquickreply,ppp,tpp,daysprune,timeformat,dst,buddylist,ignorelist,style,away,awaydate,returndate,referrer,referrals,reputation,timeonline,showcodebuttons,totalpms,unreadpms,pmfolders,notepad,threadmode,showredirect,dateformat,dstcorrection,warningpoints,moderateposts,moderationtime,suspendposting,suspensiontime,suspendsignature,suspendsigtime,coppauser,classicpostbit,loginattempts,usernotes,showimages,showvideos,passwordconvertsalt)


I'm not able to find the colums 'aim' and ' field list' both in mybb table an in ibf_users
Where I have to look?
Thank you and best regards, Mike.

  mybb problem_1.png (Size: 65.36 KB / Downloads: 4)