getting NotFoundHttpException in RouteCollection

I'm getting this error:

NotFoundHttpException in RouteCollection.php line 161:

when I make this request from my template:

<a href="{{ route('getprodpage', ['id' => $product->id, 'entity' => 'incentive']) }}">

This is my routes.php

Route::get('getprodpage/{id}/{entity?}', [
    'as' => 'getprodpage', 'uses' => 'ProductController@countProductClicks'
]);

What is wrong with this?

via Chebli Mohamed