You have an SQL-Error:
_doQuery: [Error message: Could not execute statement]
[Last executed query: select groups.*, groups2users.*, users.id , users.canton, firstname, name, mobile, telefon, user_email from groups as groups left join groups2users as groups2users on (groups2users.groupid = groups.id) left join users as users on (users.id = groups2users.userid) where ( 1 = 1 and id = 188 ) ]
[Native code: 1052]
[Native message: Column 'id' in where clause is ambiguous]
MDB2 Error: unknown error