Laravel 5.4 Internal error: Failed to retrieve the default value with fix

Using Optional Parameters

When i use optional parameters in Laravel 5.4, i get the error internal error: failed to retrieve the default value. Here is My routes:

Route::group(['middleware' => ['auth','role:SUPER_ADMIN'],'prefix' => 'SWSM-Dashboard'], function () {


Route::get('/', 'HomeController@eventDashboard');

Route::group(['prefix' => '/providers'],function (){

    Route::get('create/{providerData?}','ProvidersController@create');
    Route::get('delete/{providerId?}','ProvidersController@destroy');
    Route::get('/','ProvidersController@index');


    }); 
});

Here is my controller function

public function create($providerData){ dd('Hello'); } 

My middleware is just the standard Auth out of the box with Laravel so i'm surprised that this is not working.

via Jamie Ross