php artisan cache:clear: Call to undefined method Illuminate\Foundation\Console\ClosureCommand::setHidden()

Probably something borked in the vendor directory. Try removing the vendor directory and re-running composer to install your dependencies.

I'm getting the same issue, I already removed vendor's folder, run a clear-compiled artisan command,... nothing works for me.

I saw on the Classes and the inheritance; everything looks fine. The method exists on the class.