Laravel 9 Error: Only mailables may be queued

[RobinLists.com]

Hey there - I've been loving your templates. I just discovered you have a queue function the same as the send function.

I'm using Laravel Horizon, so queue is up and running.

Using send works great for all my emails so far.

Using queue throws an exception :(

Exception: Only mailables may be queued

On /var/www/vendor/laravel/framework/src/Illuminate/Mail/Mailer.php:412 (code 0)
Stacktrace:
#0 /var/www/vendor/snowfire/beautymail/src/Snowfire/Beautymail/Beautymail.php(98): Illuminate\Mail\Mailer->queue()
#1 /var/www/app/Services/List/Traits/ListNotificationsTrait.php(89): Snowfire\Beautymail\Beautymail->queue()
#2 /var/www/app/Http/Livewire/Robinlists/Join/Index.php(103): App\Services\List\ListService->notifyJoinRequestSent()
#3 /var/www/vendor/laravel/framework/src/Illuminate/Container/BoundMethod.php(36): App\Http\Livewire\Robinlists\Join\Index->requestJoin()
#4 /var/www/vendor/laravel/framework/src/Illuminate/Container/Util.php(41): Illuminate\Container\BoundMethod::Illuminate\Container\{closure}()
#5 /var/www/vendor/laravel/framework/src/Illuminate/Container/BoundMethod.php(93): Illuminate\Container\Util::unwrapIfClosure()
#6 /var/www/vendor/laravel/framework/src/Illuminate/Container/BoundMethod.php(37): Illuminate\Container\BoundMethod::callBoundMethod()
#7 /var/www/vendor/livewire/livewire/src/ComponentConcerns/HandlesActions.php(149): Illuminate\Container\BoundMethod::call()
#8 /var/www/vendor/livewire/livewire/src/HydrationMiddleware/PerformActionCalls.php(38): Livewire\Component->callMethod()
#9 /var/www/vendor/livewire/livewire/src/LifecycleManager.php(89): Livewire\HydrationMiddleware\PerformActionCalls::hydrate()
#10 /var/www/vendor/livewire/livewire/src/Connection/ConnectionHandler.php(13): Livewire\LifecycleManager->hydrate()
#11 /var/www/vendor/livewire/livewire/src/Controllers/HttpConnectionHandler.php(20): Livewire\Connection\ConnectionHandler->handle()
#12 /var/www/vendor/laravel/framework/src/Illuminate/Routing/ControllerDispatcher.php(48): Livewire\Controllers\HttpConnectionHandler->__invoke()
#13 /var/www/vendor/laravel/framework/src/Illuminate/Routing/Route.php(261): Illuminate\Routing\ControllerDispatcher->dispatch()
#14 /var/www/vendor/laravel/framework/src/Illuminate/Routing/Route.php(204): Illuminate\Routing\Route->runController()
#15 /var/www/vendor/laravel/framework/src/Illuminate/Routing/Router.php(725): Illuminate\Routing\Route->run()
#16 /var/www/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(141): Illuminate\Routing\Router->Illuminate\Routing\{closure}()
#17 /var/www/vendor/laravel/framework/src/Illuminate/Routing/Middleware/SubstituteBindings.php(50): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}()
#18 /var/www/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(180): Illuminate\Routing\Middleware\SubstituteBindings->handle()
#19 /var/www/vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/VerifyCsrfToken.php(78): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}()
#20 /var/www/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(180): Illuminate\Foundation\Http\Middleware\VerifyCsrfToken->handle()
#21 /var/www/vendor/laravel/framework/src/Illuminate/Session/Middleware/AuthenticateSession.php(59): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}()
#22 /var/www/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(180): Illuminate\Session\Middleware\AuthenticateSession->handle()
#23 /var/www/app/Http/Middleware/CapturesJoinCode.php(22): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}()
#24 /var/www/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(180): App\Http\Middleware\CapturesJoinCode->handle()
#25 /var/www/vendor/laravel/framework/src/Illuminate/View/Middleware/ShareErrorsFromSession.php(49): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}()
#26 /var/www/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(180): Illuminate\View\Middleware\ShareErrorsFromSession->handle()
#27 /var/www/vendor/laravel/framework/src/Illuminate/Session/Middleware/StartSession.php(121): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}()
#28 /var/www/vendor/laravel/framework/src/Illuminate/Session/Middleware/StartSession.php(64): Illuminate\Session\Middleware\StartSession->handleStatefulRequest()
#29 /var/www/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(180): Illuminate\Session\Middleware\StartSession->handle()
#30 /var/www/vendor/laravel/framework/src/Illuminate/Cookie/Middleware/AddQueuedCookiesToResponse.php(37): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}()
#31 /var/www/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(180): Illuminate\Cookie\Middleware\AddQueuedCookiesToResponse->handle()
#32 /var/www/vendor/laravel/framework/src/Illuminate/Cookie/Middleware/EncryptCookies.php(67): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}()
#33 /var/www/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(180): Illuminate\Cookie\Middleware\EncryptCookies->handle()
#34 /var/www/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(116): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}()
#35 /var/www/vendor/laravel/framework/src/Illuminate/Routing/Router.php(727): Illuminate\Pipeline\Pipeline->then()
#36 /var/www/vendor/laravel/framework/src/Illuminate/Routing/Router.php(702): Illuminate\Routing\Router->runRouteWithinStack()
#37 /var/www/vendor/laravel/framework/src/Illuminate/Routing/Router.php(666): Illuminate\Routing\Router->runRoute()
#38 /var/www/vendor/laravel/framework/src/Illuminate/Routing/Router.php(655): Illuminate\Routing\Router->dispatchToRoute()
#39 /var/www/vendor/laravel/framework/src/Illuminate/Foundation/Http/Kernel.php(167): Illuminate\Routing\Router->dispatch()
#40 /var/www/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(141): Illuminate\Foundation\Http\Kernel->Illuminate\Foundation\Http\{closure}()
#41 /var/www/vendor/livewire/livewire/src/DisableBrowserCache.php(19): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}()
#42 /var/www/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(180): Livewire\DisableBrowserCache->handle()
#43 /var/www/vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/ConvertEmptyStringsToNull.php(27): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}()
#44 /var/www/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(180): Illuminate\Foundation\Http\Middleware\ConvertEmptyStringsToNull->handle()
#45 /var/www/vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/TrimStrings.php(36): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}()
#46 /var/www/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(180): Illuminate\Foundation\Http\Middleware\TrimStrings->handle()
#47 /var/www/vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/ValidatePostSize.php(27): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}()
#48 /var/www/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(180): Illuminate\Foundation\Http\Middleware\ValidatePostSize->handle()
#49 /var/www/vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/PreventRequestsDuringMaintenance.php(86): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}()
#50 /var/www/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(180): Illuminate\Foundation\Http\Middleware\PreventRequestsDuringMaintenance->handle()
#51 /var/www/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(116): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}()
#52 /var/www/vendor/laravel/framework/src/Illuminate/Foundation/Http/Kernel.php(142): Illuminate\Pipeline\Pipeline->then()
#53 /var/www/vendor/laravel/framework/src/Illuminate/Foundation/Http/Kernel.php(111): Illuminate\Foundation\Http\Kernel->sendRequestThroughRouter()
#54 /var/www/public/index.php(52): Illuminate\Foundation\Http\Kernel->handle()
#55 {main}

[stale]

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