I see a lot of developers running into this error while using Laravel 5

FatalErrorException in compiled.php line 6391: Class 'Illuminate\Html\HtmlServiceProvider' not found

Solution

First add this line to composer.json
"illuminate/html": "~5.0"

Then do a composer update wait for the composer update to finish,
Then open the config/app.php add the line below:

'Illuminate\Html\HtmlServiceProvider',

and this

'Form'      => 'Illuminate\Html\FormFacade',
'Html'      => 'Illuminate\Html\HtmlFacade',

 and be sure when you use Html in blade or wherever use it in lowercase Html not HTML