BadMethodCallException in Macroable.php line 74 : Method controller does not exist

I'm getting little bit issue when I follow Route Controller . Web.php Code:{" Route::controller('/admin','adminController'); "} adminController.php Code: {"

When I hit "http://localhost:8000/admin/dashboard" an error Display ("BadMethodCallException in Macroable.php line 74 : Method controller does not exist.") Here is SnapShot: http://take.ms/3NqA4 Please Take a look and let me know what is wrong with code.

Thanks

via Chebli Mohamed