You apparently pasted in Jeffrey Way's Generators package with a typo. Take a look at your app/config/app.php file, in the Service Providers list starting at about line 81. Somewhere you have:

Way\GeneratorviceProvider

should be:

Way\Generators\GeneratorsServiceProvider

If in fact that is correctly, and the typo is only in your post here, then you need to use Composer to install the package first, then enable it in app.php. First, comment out the line in app.php that mentions Way's Generators package. Then run:

composer update --prefer-dist

Let that run, then re-enable the relevant line in your app.php service providers list and finally run:

php artisan optimize

and that will get your autoloader into line.

Hope that helps.