Data provider laravel phpunit doesn’t work: Argument #2 ($code) must be of type int, string given

I’m trying to do testing on a Laravel application using Phpunit and data provider (I want to test for each field being wrong, so I thought it would be awesome to use a Data Provider)
However, I can’t manage to get it to work, it always gives me this error
Argument #2 ($code) must be of type int, string is given

Here is the code I used (redacted)

Test Function

   /**
     * @dataProvider invalidAddress
     */
   public function test_admin_cannot_create_client_with_invalid_address_data($invalidAddressData,$errors){
        $this->actingAs(AppModelsUser::factory()->create());

        Livewire::test(ClientResourcePagesCreateClient::class)
                ->fillForm($invalidAddressData)
                ->call('create')
                ->assertHasFormErrors($errors);
    }

The function that generates the data

    private function getFormDataForInvalidAddress(string $field, string | int $value, string $rule = ''): array
    {
        $record = $this->client->getAttributes();
        ......
        return [$record, $rules];
    }

Data Provider

    public function invalidAddress(): array
    {
        $this->setUp();
        return [
            'missing street' => self::getFormDataForInvalidAddress('street', '', 'required'),


            'missing postal code' => self::getFormDataForInvalidAddress('postalCode', '', 'required'),
            'too long postal code' => self::getFormDataForInvalidAddress('postalCode', '888888888'),


            'non-numeric postalCode' => self::getFormDataForInvalidAddress('postalCode', 'aaaaa'),
        ];
    }

Really, I can’t figure out what I’m doing wrong. It seems all okay to me, any advice on how I can debug this?