The method fire() does not exist on PragmaRX\Firewall\Vendor\Laravel\Artisan\Base. Since it exists in all sub-types, consider adding an abstract or default implementation to PragmaRX\Firewall\Vendor\Laravel\Artisan\Base.
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Ignorable by Annotation
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If this is a false-positive, you can also ignore this issue in your code via the ignore-call annotation
Accessing firewall on the interface Illuminate\Contracts\Foundation\Application suggest that you code against a concrete implementation. How about adding an instanceof check?