Warning: require(./App/Core//ThinkPHP.php) [function.require]: failed to open stream: No such file or directory in D:\1\v9018966\wwwroot\index.php on line 15

Fatal error: require() [function.require]: Failed opening required './App/Core//ThinkPHP.php' (include_path='.;C:\php5\pear') in D:\1\v9018966\wwwroot\index.php on line 15