Class 'BeyondCode\LaravelWebSockets\ChannelManagers\FuilfilledPromise' not found

[bepsvpt]

When using beta version of laravel-websockets, there will be Class 'BeyondCode\LaravelWebSockets\ChannelManagers\FuilfilledPromise' not found exception randomly.

Following link is the line that thorws the exception:
https://github.com/beyondcode/laravel-websockets/blob/2.0.0-beta.26/src/ChannelManagers/LocalChannelManager.php#L163

Stack trace

Error Class 'BeyondCode\LaravelWebSockets\ChannelManagers\FuilfilledPromise' not found 
vendor/beyondcode/laravel-websockets/src/ChannelManagers/LocalChannelManager.php:163 BeyondCode\LaravelWebSockets\ChannelManagers\LocalChannelManager::unsubscribeFromAllChannels
vendor/beyondcode/laravel-websockets/src/Server/WebSocketHandler.php:109 BeyondCode\LaravelWebSockets\Server\WebSocketHandler::onClose
vendor/cboden/ratchet/src/Ratchet/WebSocket/WsServer.php:164 Ratchet\WebSocket\WsServer::onClose
vendor/cboden/ratchet/src/Ratchet/Http/Router.php:84 Ratchet\Http\Router::onClose
vendor/cboden/ratchet/src/Ratchet/Http/HttpServer.php:62 Ratchet\Http\HttpServer::onClose
vendor/cboden/ratchet/src/Ratchet/Server/IoServer.php:124 Ratchet\Server\IoServer::handleEnd
vendor/cboden/ratchet/src/Ratchet/Server/IoServer.php:98 Ratchet\Server\IoServer::Ratchet\Server\{closure}
vendor/evenement/evenement/src/Evenement/EventEmitterTrait.php:123 Evenement\EventEmitter::emit
vendor/react/stream/src/Util.php:71 React\Stream\Util::React\Stream\{closure}
vendor/evenement/evenement/src/Evenement/EventEmitterTrait.php:123 Evenement\EventEmitter::emit
vendor/react/stream/src/DuplexResourceStream.php:138 React\Stream\DuplexResourceStream::close
vendor/react/stream/src/DuplexResourceStream.php:197 React\Stream\DuplexResourceStream::handleData
vendor/react/event-loop/src/StreamSelectLoop.php:245 React\EventLoop\StreamSelectLoop::waitForStreamActivity
vendor/react/event-loop/src/StreamSelectLoop.php:212 React\EventLoop\StreamSelectLoop::run
vendor/cboden/ratchet/src/Ratchet/Server/IoServer.php:74 Ratchet\Server\IoServer::run
vendor/beyondcode/laravel-websockets/src/Console/Commands/StartServer.php:256 BeyondCode\LaravelWebSockets\Console\Commands\StartServer::startServer
vendor/beyondcode/laravel-websockets/src/Console/Commands/StartServer.php:86 BeyondCode\LaravelWebSockets\Console\Commands\StartServer::handle
vendor/laravel/framework/src/Illuminate/Container/BoundMethod.php:36 Illuminate\Container\BoundMethod::Illuminate\Container\{closure}
vendor/laravel/framework/src/Illuminate/Container/Util.php:40 Illuminate\Container\Util::unwrapIfClosure
vendor/laravel/framework/src/Illuminate/Container/BoundMethod.php:93 Illuminate\Container\BoundMethod::callBoundMethod
vendor/laravel/framework/src/Illuminate/Container/BoundMethod.php:37 Illuminate\Container\BoundMethod::call
vendor/laravel/framework/src/Illuminate/Container/Container.php:596 Illuminate\Container\Container::call
vendor/laravel/framework/src/Illuminate/Console/Command.php:136 Illuminate\Console\Command::execute
vendor/symfony/console/Command/Command.php:258 Symfony\Component\Console\Command\Command::run
vendor/laravel/framework/src/Illuminate/Console/Command.php:121 Illuminate\Console\Command::run
vendor/symfony/console/Application.php:920 Symfony\Component\Console\Application::doRunCommand
vendor/symfony/console/Application.php:266 Symfony\Component\Console\Application::doRun
vendor/symfony/console/Application.php:142 Symfony\Component\Console\Application::run
vendor/laravel/framework/src/Illuminate/Console/Application.php:93 Illuminate\Console\Application::run
vendor/laravel/framework/src/Illuminate/Foundation/Console/Kernel.php:129 Illuminate\Foundation\Console\Kernel::handle
artisan:37 [main]

[rennokki]

Commited to 2.x, will come later on -beta.31