You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'GROUP BY
                n1.ID
            ORDER BY
                n1.l ASC' at line 1<br><br>
            SELECT
                n1.id
            FROM
                xt_files_tree AS n1,
                xt_files_tree AS n2
            WHERE
                n2.id ='179'
                AND n1.l <= n2.l
                AND n1.r >= n2.r
                AND n1.tree_id = 
            GROUP BY
                n1.ID
            ORDER BY
                n1.l ASC
        <br><br>In File: <span style="color:red;">/var/www/vhosts/egokiefer.ch/httpdocs/xt/plugins/ch.iframe.snode.filemanager/tree/index.php</span><br />On Line: <span style="color:red;">109</span><br />
<b>Fatal error</b>:  Call to a member function FetchRow() on a non-object in <b>/var/www/vhosts/egokiefer.ch/httpdocs/xt/plugins/ch.iframe.snode.filemanager/tree/index.php</b> on line <b>114</b><br />