Hej. So I have this package : d-damien/flarum-ext-contact-request

When installing it I have the Class "DDamien\ContactRequest\Notification\ContactRequestSent" not found error. It is a small package I made. Could someone please point me to what I missed ?

Stack traces follow.
At first enabling attempt :

[2024-06-25 14:48:22] flarum.ERROR: Error: Class "DDamien\ContactRequest\Notification\ContactRequestSent" not found in /var/www/web/vendor/flarum/core/src/Extend/Notification.php:37
Stack trace:
#0 /var/www/web/vendor/d-damien/flarum-contact-request/extend.php(32): Flarum\Extend\Notification->type()
#1 /var/www/web/vendor/flarum/core/src/Extension/Extension.php(373): require('...')
#2 /var/www/web/vendor/flarum/core/src/Extension/Extension.php(388): Flarum\Extension\Extension->getExtenders()
#3 /var/www/web/vendor/flarum/core/src/Extension/Extension.php(303): Flarum\Extension\Extension->getLifecycleExtenders()
#4 /var/www/web/vendor/flarum/core/src/Extension/ExtensionManager.php(216): Flarum\Extension\Extension->enable()
#5 /var/www/web/vendor/flarum/core/src/Extension/Command/ToggleExtensionHandler.php(36): Flarum\Extension\ExtensionManager->enable()
#6 /var/www/web/vendor/illuminate/bus/Dispatcher.php(122): Flarum\Extension\Command\ToggleExtensionHandler->handle()
#7 /var/www/web/vendor/illuminate/pipeline/Pipeline.php(128): Illuminate\Bus\Dispatcher->Illuminate\Bus\{closure}()
#8 /var/www/web/vendor/illuminate/pipeline/Pipeline.php(103): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}()
#9 /var/www/web/vendor/illuminate/bus/Dispatcher.php(132): Illuminate\Pipeline\Pipeline->then()
#10 /var/www/web/vendor/illuminate/bus/Dispatcher.php(78): Illuminate\Bus\Dispatcher->dispatchNow()
#11 /var/www/web/vendor/flarum/core/src/Api/Controller/UpdateExtensionController.php(42): Illuminate\Bus\Dispatcher->dispatch()
#12 /var/www/web/vendor/flarum/core/src/Http/RouteHandlerFactory.php(41): Flarum\Api\Controller\UpdateExtensionController->handle()
#13 /var/www/web/vendor/flarum/core/src/Http/Middleware/ExecuteRoute.php(27): Flarum\Http\RouteHandlerFactory->Flarum\Http\{closure}()
#14 /var/www/web/vendor/laminas/laminas-stratigility/src/Next.php(49): Flarum\Http\Middleware\ExecuteRoute->process()
#15 /var/www/web/vendor/anaximandre/flarum-nutriknow/src/Middleware/EmailOnlyLogin.php(24): Laminas\Stratigility\Next->handle()
#16 /var/www/web/vendor/laminas/laminas-stratigility/src/Next.php(49): Anaximandre\Nutriknow\Middleware\EmailOnlyLogin->process()
#17 /var/www/web/vendor/flarum/core/src/Api/Middleware/ThrottleApi.php(33): Laminas\Stratigility\Next->handle()
#18 /var/www/web/vendor/laminas/laminas-stratigility/src/Next.php(49): Flarum\Api\Middleware\ThrottleApi->process()
#19 /var/www/web/vendor/flarum/core/src/Http/Middleware/CheckCsrfToken.php(44): Laminas\Stratigility\Next->handle()
#20 /var/www/web/vendor/laminas/laminas-stratigility/src/Next.php(49): Flarum\Http\Middleware\CheckCsrfToken->process()
#21 /var/www/web/vendor/flarum/core/src/Http/Middleware/ResolveRoute.php(69): Laminas\Stratigility\Next->handle()
#22 /var/www/web/vendor/laminas/laminas-stratigility/src/Next.php(49): Flarum\Http\Middleware\ResolveRoute->process()
#23 /var/www/web/vendor/flarum/core/src/Http/Middleware/SetLocale.php(51): Laminas\Stratigility\Next->handle()
#24 /var/www/web/vendor/laminas/laminas-stratigility/src/Next.php(49): Flarum\Http\Middleware\SetLocale->process()
#25 /var/www/web/vendor/flarum/core/src/Http/Middleware/AuthenticateWithHeader.php(58): Laminas\Stratigility\Next->handle()
#26 /var/www/web/vendor/laminas/laminas-stratigility/src/Next.php(49): Flarum\Http\Middleware\AuthenticateWithHeader->process()
#27 /var/www/web/vendor/flarum/core/src/Http/Middleware/AuthenticateWithSession.php(31): Laminas\Stratigility\Next->handle()
#28 /var/www/web/vendor/laminas/laminas-stratigility/src/Next.php(49): Flarum\Http\Middleware\AuthenticateWithSession->process()
#29 /var/www/web/vendor/flarum/core/src/Http/Middleware/RememberFromCookie.php(52): Laminas\Stratigility\Next->handle()
#30 /var/www/web/vendor/laminas/laminas-stratigility/src/Next.php(49): Flarum\Http\Middleware\RememberFromCookie->process()
#31 /var/www/web/vendor/flarum/core/src/Http/Middleware/StartSession.php(61): Laminas\Stratigility\Next->handle()
#32 /var/www/web/vendor/laminas/laminas-stratigility/src/Next.php(49): Flarum\Http\Middleware\StartSession->process()
#33 /var/www/web/vendor/flarum/core/src/Api/Middleware/FakeHttpMethods.php(29): Laminas\Stratigility\Next->handle()
#34 /var/www/web/vendor/laminas/laminas-stratigility/src/Next.php(49): Flarum\Api\Middleware\FakeHttpMethods->process()
#35 /var/www/web/vendor/flarum/core/src/Http/Middleware/ParseJsonBody.php(28): Laminas\Stratigility\Next->handle()
#36 /var/www/web/vendor/laminas/laminas-stratigility/src/Next.php(49): Flarum\Http\Middleware\ParseJsonBody->process()
#37 /var/www/web/vendor/flarum/core/src/Http/Middleware/HandleErrors.php(57): Laminas\Stratigility\Next->handle()
#38 /var/www/web/vendor/laminas/laminas-stratigility/src/Next.php(49): Flarum\Http\Middleware\HandleErrors->process()
#39 /var/www/web/vendor/flarum/core/src/Http/Middleware/InjectActorReference.php(25): Laminas\Stratigility\Next->handle()
#40 /var/www/web/vendor/laminas/laminas-stratigility/src/Next.php(49): Flarum\Http\Middleware\InjectActorReference->process()
#41 /var/www/web/vendor/laminas/laminas-stratigility/src/MiddlewarePipe.php(75): Laminas\Stratigility\Next->handle()
#42 /var/www/web/vendor/middlewares/request-handler/src/RequestHandler.php(84): Laminas\Stratigility\MiddlewarePipe->process()
#43 /var/www/web/vendor/laminas/laminas-stratigility/src/Next.php(49): Middlewares\RequestHandler->process()
#44 /var/www/web/vendor/middlewares/base-path-router/src/BasePathRouter.php(99): Laminas\Stratigility\Next->handle()
#45 /var/www/web/vendor/laminas/laminas-stratigility/src/Next.php(49): Middlewares\BasePathRouter->process()
#46 /var/www/web/vendor/laminas/laminas-stratigility/src/Middleware/OriginalMessages.php(36): Laminas\Stratigility\Next->handle()
#47 /var/www/web/vendor/laminas/laminas-stratigility/src/Next.php(49): Laminas\Stratigility\Middleware\OriginalMessages->process()
#48 /var/www/web/vendor/middlewares/base-path/src/BasePath.php(73): Laminas\Stratigility\Next->handle()
#49 /var/www/web/vendor/laminas/laminas-stratigility/src/Next.php(49): Middlewares\BasePath->process()
#50 /var/www/web/vendor/flarum/core/src/Http/Middleware/ProcessIp.php(24): Laminas\Stratigility\Next->handle()
#51 /var/www/web/vendor/laminas/laminas-stratigility/src/Next.php(49): Flarum\Http\Middleware\ProcessIp->process()
#52 /var/www/web/vendor/laminas/laminas-stratigility/src/MiddlewarePipe.php(75): Laminas\Stratigility\Next->handle()
#53 /var/www/web/vendor/laminas/laminas-stratigility/src/MiddlewarePipe.php(64): Laminas\Stratigility\MiddlewarePipe->process()
#54 /var/www/web/vendor/laminas/laminas-httphandlerrunner/src/RequestHandlerRunner.php(73): Laminas\Stratigility\MiddlewarePipe->handle()
#55 /var/www/web/vendor/flarum/core/src/Http/Server.php(45): Laminas\HttpHandlerRunner\RequestHandlerRunner->run()
#56 /var/www/web/public/index.php(26): Flarum\Http\Server->listen()
#57 {main}

On subsequest requests, the website fails entirely with "Flarum encountered a boot error." :

#0 /var/www/web/vendor/d-damien/flarum-contact-request/extend.php(32): Flarum\Extend\Notification->type()
#1 /var/www/web/vendor/flarum/core/src/Extension/Extension.php(373): require('...')
#2 /var/www/web/vendor/flarum/core/src/Extension/Extension.php(139): Flarum\Extension\Extension->getExtenders()
#3 /var/www/web/vendor/flarum/core/src/Extension/ExtensionManager.php(390): Flarum\Extension\Extension->extend()
#4 /var/www/web/vendor/flarum/core/src/Extension/ExtensionServiceProvider.php(31): Flarum\Extension\ExtensionManager->extend()
#5 [internal function]: Flarum\Extension\ExtensionServiceProvider->Flarum\Extension\{closure}()
#6 /var/www/web/vendor/flarum/core/src/Foundation/Application.php(329): call_user_func()
#7 /var/www/web/vendor/flarum/core/src/Foundation/Application.php(270): Flarum\Foundation\Application->fireAppCallbacks()
#8 /var/www/web/vendor/flarum/core/src/Foundation/InstalledSite.php(151): Flarum\Foundation\Application->boot()
#9 /var/www/web/vendor/flarum/core/src/Foundation/InstalledSite.php(82): Flarum\Foundation\InstalledSite->bootLaravel()
#10 /var/www/web/vendor/flarum/core/src/Http/Server.php(59): Flarum\Foundation\InstalledSite->bootApp()
#11 /var/www/web/vendor/flarum/core/src/Http/Server.php(36): Flarum\Http\Server->safelyBootAndGetHandler()
#12 /var/www/web/public/index.php(26): Flarum\Http\Server->listen()
#13 {main}