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

Faced the same issue and got a number of guidelines to resolve this. Unfortunately none of those worked or me. Actually there is no additional step or tasks needed to be addressed to fix this issue.

Just follow the official upgrade guide from https://laravel.com/docs/5.6/upgrade and along with that remove the trustedproxy config file located at config/trustedproxy.php