Cannot use Illuminate\Database\Eloquent\Model as Model because the name is already in use

提示错误：Cannot use Illuminate\Database\Eloquent\Model as Model because the name is already in use
一个方法里面执行两次查询
public function address(Request $request)
{
$session_id = 'session_1545113237';
$user_arr = User::where('session_id',$session_id)->first();
$user_address = Addre::where('user_id',16)->first();
print_r($user_arr);
print_r($user_address);
}

下面这两行
$user_arr = User::where('session_id',$session_id)->first();
$user_address = Addre::where('user_id',16)->first();
去掉其中一行，就可以查询出结果，
如果是两行则出错
Cannot use Illuminate\Database\Eloquent\Model as Model because the name is already in use