Warning: require(./App/Core//ThinkPHP.php): failed to open stream: No such file or directory in D:\1\v7099197\wwwroot\index.php on line 19

Fatal error: require(): Failed opening required './App/Core//ThinkPHP.php' (include_path='.;C:\php\pear') in D:\1\v7099197\wwwroot\index.php on line 19