Laravel 5 | PHPUnit Testing Error

I just wanna to get the Status Code of the link(Path).

[I use Auth too]

MY INPUT :

public function testPath()
{
    $this->withoutMiddleware();
    $this->call('GET', '/admin/create');
    $this->assertResponseStatus(200);
}

Even i check this on Browser, I get proper response. But in PHPUnit testing, i get the following error...

1) ItemsTest::testPath
   Expected status code 200, got 500.
   Failed asserting that 500 matches expected 200

What is Wrong with my testing code...?