Undefined Array Key 1 about laravel-postmark-webhooks

[Dynalogical]

//EventServiceProvider

protected $listen = [ Registered::class => [ SendEmailVerificationNotification::class, ], PostmarkWebhookCalled::class => [ 'webhook.postmark: delivery' => [delivery::class], ], ];

//Delivery

public function handle(PostmarkWebhookCalled $event) { Log::info("hello darkness my old friend"); }

And the config file:

`'path' => '/v1/api/webhooks/postmark',

/*
|--------------------------------------------------------------------------
| Log Options
|--------------------------------------------------------------------------
|
| Logging events to the database is enabled by default. You may set this
| to false if you don't want to log the Postmark events to the database.
|
| You may specify one or more event types to be excluded from being
| logged to the database. You can place them under the except key.
|
| Supported event types: "open", "bounce", "click",
| "delivery", "spam_complaint"
|
*/

'log' => [
    'enabled' => env('POSTMARK_WEBHOOKS_LOG_ENABLED', true),
    'model' => \Mvdnbrk\PostmarkWebhooks\PostmarkWebhook::class,
    'table_name' => 'postmark_webhook_logs',

    'except' => [
        //
    ],
],

/*
|--------------------------------------------------------------------------
| Event Mapping
|--------------------------------------------------------------------------
|
| This option allows you to map Postmark webhook
| events to your own object-based events.
|
*/

'events' => [

],`