Upgrade to laravel 5.1 broke my login

I had a site with login that was using the laravel Auth class. I accidentally ran a composer update, which upgraded my app. And now the authentication broke.

All I get when I try to login is this..

  call_user_func_array() expects parameter 1 to be a valid callback, class 'Illuminate\Auth\Guard' does not have a method 'handle'

Does something in the Guard class need to change? Any ideas?

via Chebli Mohamed