Upgraded to Laravel 5.4 - Some routes now fail?

Question

I had a completely working project on Laravel 5.3, yesterday I upgraded to Laravel 5.4 locally to check all was working and was very happy so put a plan in place to move it live.

Where I have now deployed the site on my forge.laravel.com managed servers, most of the routes work okay but when trying to log out I get the following error:

I'm not quite sure what the issue actually is. This site works totally fine locally. Can anyone point me in the right direction?

Answer 1

As a quick fix (after emailing Taylor) he suggested that I comment out the \Illuminate\Foundation\Http\Middleware\ValidatePostSize::class, middleware inside app\Html\Kernal.php

Tried it and it worked perfectly!

Easy fix when you know how! haha