Upgrading Laravel 5.5 to 5.6 error

Question

I am trying to upgrade my Laravel 5.5 to 5.6. I have followed the instructions from the laravel website, yet I got this error:

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Answer 1

Your problem comes from your use of the library TrustedProxy.

It uses Symfony's HEADER_CLIENT_IP constant which was deprecated with Symfony 3.3 and completely removed in Symfony 4.0.

Since Laravel 5.6 has updated to use Symfony 4 components, this will no longer work.

The way to solve it is to do what patricus suggested and use Laravel's TrustProxies middleware.