Undefined Offset 0

[1usman]

Trying to use on Laravel 5.6, after registering new auth it starts giving the following error on using artisan command to either migrate or perform any operation.

In Router.php line 1224:

Undefined offset: 0

[Deleted user]

check your RouteServiceProvider then add this function
protected function mapAdminRoutes()
{
Route::group([
'middleware' => ['web', 'admin', 'auth:admin'],
'prefix' => 'admin',
'as' => 'admin.',
'namespace' => $this->namespace,
], function ($router) {
require base_path('routes/admin.php');
});
}