Warning: require(E:\www\xmb\ThinkPHP\ThinkPHP.php): failed to open stream: No such file or directory in E:\www\xmb\index.php on line 31

Fatal error: require(): Failed opening required './ThinkPHP/ThinkPHP.php' (include_path='C:\xampp\php\PEAR') in E:\www\xmb\index.php on line 31