[InvalidArgumentException] Unknown connection scheme: 'redis'

I've been trying this plugin for mailing purpose. Somehow I've an issue connecting to redis.

When I'm using predis directly, I can't connect and submit my data to the redis.

This is my stack trace

2021-01-20 08:33:30 Error: [InvalidArgumentException] Unknown connection scheme: 'redis'. in C:\Dev\www\emailtemplate\vendor\predis\predis\src\Connection\Factory.php on line 87
Stack Trace:
- C:\Dev\www\emailtemplate\vendor\predis\predis\src\Client.php:120
- C:\Dev\www\emailtemplate\vendor\predis\predis\src\Client.php:59
- C:\Dev\www\emailtemplate\vendor\enqueue\redis\PRedis.php:126
- C:\Dev\www\emailtemplate\vendor\enqueue\redis\RedisConnectionFactory.php:105
- C:\Dev\www\emailtemplate\vendor\enqueue\redis\RedisConnectionFactory.php:89
- call_user_func - [internal], line ??- C:\Dev\www\emailtemplate\vendor\enqueue\redis\RedisContext.php:160
- C:\Dev\www\emailtemplate\vendor\enqueue\redis\RedisProducer.php:70
- C:\Dev\www\emailtemplate\vendor\enqueue\enqueue\Client\Driver\GenericDriver.php:225
- C:\Dev\www\emailtemplate\vendor\enqueue\enqueue\Client\Driver\GenericDriver.php:62
- C:\Dev\www\emailtemplate\vendor\enqueue\enqueue\Client\Producer.php:121
- C:\Dev\www\emailtemplate\vendor\enqueue\enqueue\Client\Producer.php:53
- C:\Dev\www\emailtemplate\vendor\enqueue\simple-client\SimpleClient.php:185
- C:\Dev\www\emailtemplate\vendor\cakephp\queue\src\QueueManager.php:217
- C:\Dev\www\emailtemplate\vendor\cakephp\queue\src\Mailer\QueueTrait.php:53
- C:\Dev\www\emailtemplate\src\Controller\Api\EmailsController.php:120
- C:\Dev\www\emailtemplate\vendor\cakephp\cakephp\src\Controller\Controller.php:529
- C:\Dev\www\emailtemplate\vendor\cakephp\cakephp\src\Controller\ControllerFactory.php:79
- C:\Dev\www\emailtemplate\vendor\cakephp\cakephp\src\Http\BaseApplication.php:251
- C:\Dev\www\emailtemplate\vendor\cakephp\cakephp\src\Http\Runner.php:77
- C:\Dev\www\emailtemplate\vendor\cakephp\authorization\src\Middleware\AuthorizationMiddleware.php:129
- C:\Dev\www\emailtemplate\vendor\cakephp\cakephp\src\Http\Runner.php:73
- C:\Dev\www\emailtemplate\vendor\cakephp\authentication\src\Middleware\AuthenticationMiddleware.php:122
- C:\Dev\www\emailtemplate\vendor\cakephp\cakephp\src\Http\Runner.php:73
- C:\Dev\www\emailtemplate\vendor\cakephp\cakephp\src\Routing\Middleware\RoutingMiddleware.php:166
- C:\Dev\www\emailtemplate\vendor\cakephp\cakephp\src\Http\Runner.php:73
- C:\Dev\www\emailtemplate\vendor\cakephp\cakephp\src\Http\Middleware\BodyParserMiddleware.php:174
- C:\Dev\www\emailtemplate\vendor\cakephp\cakephp\src\Http\Runner.php:73
- C:\Dev\www\emailtemplate\vendor\cakephp\cakephp\src\Routing\Middleware\RoutingMiddleware.php:166
- C:\Dev\www\emailtemplate\vendor\cakephp\cakephp\src\Http\Runner.php:73
- C:\Dev\www\emailtemplate\vendor\cakephp\cakephp\src\Routing\Middleware\AssetMiddleware.php:68
- C:\Dev\www\emailtemplate\vendor\cakephp\cakephp\src\Http\Runner.php:73
- C:\Dev\www\emailtemplate\vendor\cakephp\cakephp\src\Error\Middleware\ErrorHandlerMiddleware.php:121
- C:\Dev\www\emailtemplate\vendor\cakephp\cakephp\src\Http\Runner.php:73
- C:\Dev\www\emailtemplate\vendor\cakephp\debug_kit\src\Middleware\DebugKitMiddleware.php:60
- C:\Dev\www\emailtemplate\vendor\cakephp\cakephp\src\Http\Runner.php:73
- C:\Dev\www\emailtemplate\vendor\cakephp\cakephp\src\Http\Runner.php:58
- C:\Dev\www\emailtemplate\vendor\cakephp\cakephp\src\Http\Server.php:90
- C:\Dev\www\emailtemplate\webroot\index.php:40

My configuration look like this.

'DebugKit' => [
        'ignoreAuthorization' => true,
    ],
	
	'Queue' => [
		'default' => [
			  // A DSN for your configured backend. default: null
			  'url' => 'redis:',
			  //'url' => 'redis://127.0.0.1:6397',

			  // The queue that will be used for sending messages. default: default
			  // This can be overriden when queuing or processing messages
			  'queue' => 'default',

			  // The name of a configured logger, default: null
			  'logger' => 'stdout',

			  // The name of an event listener class to associate with the worker
			  //'listener' => \App\Listener\WorkerListener::class,
		]
	],

Beginne mit der in der Issue gezeigten Queue-Konfiguration und verfolge die Redis-Verbindung durch die erwähnten Einträge RedisConnectionFactory.php und PRedis.php. Reproduziere den gemeldeten Fehler wegen eines unbekannten Schemas und überprüfe anschließend, dass die konfigurierte Redis DSN akzeptiert wird und sich queued mail ohne diese Ausnahme verbinden kann.