Cannot re-assign $this in /home/webuser/public_html/Billing/plugins/db_mapping/PostNuke_726.php on line 201

I get a blank page when I try installing DB mapping plugins. Specifically, I've tried PostNuke and OsCommerce. My error_log says this: Quote: [17-Dec-2008 17:45:53] PHP Fatal error: Cannot re-assign $this in /home/webuser/public_html/Billing/plugins/db_mapping/PostNuke_726.php on line 201 Looking at line 201, there's this function: Code:

    function account_add($account_id)
    {
        $db_map = new db_mapping;
        $db_map->MAP_account_add ($account_id, $this);

        ### Sync the groups for this account:
        if( $this->map['group_type'] != 'none' &&
            $this->map['group_type'] != 'add_remove' )
        $this->account_group_sync( $account_id );
    }

Same error for both, but OsCommerce is line 190