Warning: main() [function.main]: Unable to access ./commun/def_inc.php3 in index.php3 on line 2

Warning: main(./commun/def_inc.php3) [function.main]: failed to open stream: No such file or directory in index.php3 on line 2

Fatal error: main() [function.require]: Failed opening required './commun/def_inc.php3' (include_path='.:/include/') in index.php3 on line 2