post request by axios to laravel giving 500 error

I am using Laravel with Vue making http request with the axios. It is giving 500 error. My request code is

axios.post('user', {
       first_name: this.user.first_name,
       last_name: this.user.last_name,
       email: this.user.email,
       phone_number: this.user.phone_number,
       is_active: this.user.is_active,
       entity: this.user.entity,
       role_id: this.user.role_id
     })

Lavael Route is

Route::resource('user', 'UserController');

And Controller is

public function store(Request $request)
{
    $this->validate($request, [
      'first_name' => 'required|max:255',
      'last_name' => 'required|max:255',
      'email' => 'required',
      'is_active' => 'required'
    ]);

    $user = User::create([
      'first_name' => request('first_name'),
      'last_name' => request('last_name'),
      'email' => request('email'),
      'is_active' => request('is_active'),
      'phone_number' => request('phone_number'),
      'role_id' => request('role_id')
    ]);

    return response()->json([
      'user' => $user,
      'message' => 'Success'
    ], 200);

}

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