thinkphp5报错：Call to a member function fetch() on null

问题：

Thinkphp5报错：

Call to a member function fetch() on null

1	Call to a member function fetch() on null

需要在构造方法里添加继承父级构造方法

public function __construct(){
	parent::__construct;
}

public function __construct(){

parent::__construct;

}