منتدى استراحات زايد

After testing impex on a tesvb forum with no previously imported datas, I was going to do it for real today on my live site, as I thought I knew enough to do it.

On this live site I used impex 2 years ago to import a phpBB2 forum (everything, users, forums, posts, mp, etc).

Today when I try entering the impex system, I get errors like this:

Code:
Warning: require_once([path]/impex/systems/phpBB2/000.php) [function.require-once]: failed to open stream: No such file or directory in [path]/impex/index.php on line 382

Fatal error: require_once() [function.require]: Failed opening required '/home/mysiteuser/www/forum/impex/systems/phpBB2/000.php' (include_path='.:/usr/share/php5') in /home/mysiteuser/www/forum/impex/index.php on line 382
It is not related to my server as impex seems to work on a testvb directory.
I cleared cache, deleted a session directly in PhpMyAdmin but the system keeps on asking files that are related to a previous import (2 years ago - phpBB2).
In impex directory I only uploaded the system I want to import, wordpress cms because I don't need the others.
My config file has been checked many times. Previous phpBB2 and actual wordpress are in the same database (I checked the prefix in the config file and I input the correct wordpress prefix - not the phpBB2 prefix).

So what do I have to clear to at least get the first impex page where I am asked to select the system I want to import ?
Some datas seem to be cached somewhere.