Warning: require(__DIR__/../thinkphp/start.php) [function.require]: failed to open stream: No such file or directory in D:\WEBROOT\doc\public\index.php on line 17

Fatal error: require() [function.require]: Failed opening required '__DIR__/../thinkphp/start.php' (include_path='.;C:\php5\pear') in D:\WEBROOT\doc\public\index.php on line 17