Fatal error: Uncaught Error: Call to undefined function Think\C() in D:\php_web\yy-team\ThinkPHP\Library\Think\Think.class.php:304 Stack trace: #0 D:\php_web\yy-team\ThinkPHP\Library\Think\Think.class.php(273): Think\Think::halt(Array) #1 [internal function]: Think\Think::fatalError() #2 {main} thrown in D:\php_web\yy-team\ThinkPHP\Library\Think\Think.class.php on line 304