Avatar + Last JCommets + phpbb3

[jc2]

i had installed plugin and i set the configuration for phpbb forum using Rokbridge. it's working perfect,  i can see the avatars from phpbb forum in the comments.

I'm using last comments module and here is the problem.
I set option Avatars ON (module) also i set enable Mambots ON, then i can see the avatars in the module (last comments) but when i try to see or write a comment, joomla show me this menssage JError Imposible conectar con lel driver de la base de datos: (Spanish) "JError driver not connect with the database".

If i set mambots OFF in the module, i could again see and write comments but the module would not show the avatars.

what can i do?