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Question

I'm getting the following error when I login with username and password:

I've tried:

cache:clear 
route:clear 
view:clear 
config:clear 

but it not working

Answer 1

php artisan optimize 

When you clear you cache you have to config it as well. Optimize command will do that for you (also clear your routes,files etc etc all in 1), or php artisan config:cache after clear

But that issue could come from your form itself. Make sure in your form you have this field inside :

<form method="POST" action="/myPage">
    @csrf

// html goes here.
</form