url case matter

I name a controller as "SelectRoomController", url can not find

my url: /admin/selectroom/index

Phalcon\Mvc\Dispatcher\Exception: MyApp\Controllers\Admin\SelectroomController handler class cannot be loaded
 File=/opt/nginx/html/ycf_direct_selling/public/index.php
 Line=39
 Trace=#0 [internal function]: Phalcon\Mvc\Dispatcher->_throwDispatchException('MyApp\\Controlle...', 2)
1 [internal function]: Phalcon\Dispatcher->dispatch()
2 /opt/nginx/html/ycf_direct_selling/public/index.php(39): Phalcon\Mvc\Application->handle()
3 {main}