To Fix this remove the outdated package "illuminate/html": "^5.0" and replace with new Laravel collective package as shown below

Step 1: Remove "illuminate/html": "^5.0" from composer JSON

//Remove from composer.json
"illuminate/html": "^5.0",

//Remove service providerfrom config/app
'Illuminate\Html\HtmlServiceProvider'

//Remove aliases from config/app
'Form'=> 'Illuminate\Html\FormFacade', 
'HTML'=> 'Illuminate\Html\HtmlFacade',

Step 2: Update composer.json with "laravelcollective/html": "5.2.*"

{
    "name": "laravel/laravel",
    "description": "The Laravel Framework.",
    "keywords": ["framework", "laravel"],
    "license": "MIT",
    "type": "project",
    "require": {
        "php": ">=5.5.9",
        "laravel/framework": "5.2.*",
        "laravelcollective/html": "5.2.*"
    },
}

Step 3: Update composer

composer update

Step 4: Register new providers and aliases on config/app.php

//Provider
Collective\Html\HtmlServiceProvider::class

//Aliases
'Form' => Collective\Html\FormFacade::class,
'Html' => Collective\Html\HtmlFacade::class,