Fatal error: Uncaught Error: Class '\m\index\index' not found

本地可以找到，所有的源码都上传了，但是阿里云提示找不到。
public function route()

{
    $M = @$_GET['m']?$_GET['m']:$this->config['M'];
    $C = @$_GET['c']?$_GET['c']:$this->config['C'];
    $A = @$_GET['a']?$_GET['a']:$this->config['A'];
    //参数分隔符
    $s = $this->config['P']?$this->config['P']:'_';
    $f = '\\m\\' . $M .'\\' .$C;
    $new = new $f;// 此处出错
    //参数数组
    $P = array();
    $p = @$_GET['p']?$_GET['p']:'';
    $P = explode($s,$p);
    call_user_func_array(array($new,$A),$P); 
}