Warning: require(./../extension.inc): failed to open stream: No such file or directory in E:\Web\localhost_81\phpBB2plus\phpBB2\admin\index.php on line 30

Fatal error: require(): Failed opening required './../extension.inc' (include_path='.;e:\Web\thirdparty') in E:\Web\localhost_81\phpBB2plus\phpBB2\admin\index.php on line 30