Controller can't be loaded:9

FILE: /var/www/html/ThinkPHP/Library/Think/App.class.php 　LINE: 101

#0 /var/www/html/ThinkPHP/Library/Think/App.class.php(101): E('Controller can'...')
#1 /var/www/html/ThinkPHP/Library/Think/App.class.php(204): Think\App::exec()
#2 /var/www/html/ThinkPHP/Library/Think/Think.class.php(120): Think\App::run()
#3 /var/www/html/ThinkPHP/ThinkPHP.php(97): Think\Think::start()
#4 /var/www/html/index.php(20): require('/var/www/html/T...')
#5 {main}