Two lines in file_info_context_coursecat.php are missing "AS" in the SQL command causing an error when attempting to view the server files in tree mode.

207 $rs = $DB->get_recordset_sql('SELECT ctx.id contextid, c.visible -> $rs = $DB>get_recordset_sql('SELECT ctx.id AS contextid, c.visible

229 $rs = $DB->get_recordset_sql('SELECT ctx.id contextid, c.visible -> $rs = $DB>get_recordset_sql('SELECT ctx.id AS contextid, c.visible

The error was discovered on v. 2.3.3 but appears not to have been fixed on 2.4 either.