Answers for "Class 'Form' not found laravel 5.1"

Class 'Form' not found

composer require "laravelcollective/html"

Class 'Form' not found

'providers' => [
    // ...
    CollectiveHtmlHtmlServiceProvider::class,
    // ...
],

'aliases' => [
    // ...
   'Form' => CollectiveHtmlFormFacade::class,
   'Html' => CollectiveHtmlHtmlFacade::class,
    // ...
],