Unknown fields

I got the following errors (a lot of line like that) when getting the lines to translate from a module :

user warning: Champ 'source' inconnu dans where clause query: SELECT COUNT(tid) FROM lt_source WHERE source = 'BlockBar' and project= 'blockbar'; in c:\documents and settings\tgu\my documents\mes sites\restosh51\includes\database.mysql.inc on line 172.
user warning: Champ 'source' inconnu dans where clause query: SELECT COUNT(tid) FROM lt_source WHERE source = 'BlockBar settings' and project= 'blockbar'; in c:\documents and settings\tgu\my documents\mes sites\restosh51\includes\database.mysql.inc on line 172.

"Champ 'source' inconnu" means "source field unknown"