Upgrade from GitLab 6.4.3 to latest

Hello im trying to upgrade gitlab from GitLab 6.4.3 38397db to latest 8.13.

I have a server running 6.4.3 with manual install on ubuntu, and now i have a new server running the latest 8.13.
On the old gitlab i made a mysql dump and then a db_convert.py. Dropped the db on embedded postgres and created it again, since the import failed and made it rollback. After this point i had on the gitlab page a 500 error with the log


Any help would to fix this will be appreciated, thanks.

Any help please?