You have following errors while sending messages.

• a32 [1] : GuzzleHttp\Exception\ClientException: Client error: `POST https://fcm.googleapis.com/fcm/send` resulted in a `404 Not Found` response:

  No (truncated...) in /home3/citycoll/public_html/infotec.pk/message/vendor/guzzlehttp/guzzle/src/Exception/RequestException.php:113 Stack trace: #0 /home3/citycoll/public_html/infotec.pk/message/vendor/guzzlehttp/guzzle/src/Middleware.php(66): GuzzleHttp\Exception\RequestException::create(Object(GuzzleHttp\Psr7\Request), Object(GuzzleHttp\Psr7\Response)) #1 /home3/citycoll/public_html/infotec.pk/message/vendor/guzzlehttp/promises/src/Promise.php(203): GuzzleHttp\Middleware::GuzzleHttp\{closure}(Object(GuzzleHttp\Psr7\Response)) #2 /home3/citycoll/public_html/infotec.pk/message/vendor/guzzlehttp/promises/src/Promise.php(156): GuzzleHttp\Promise\Promise::callHandler(1, Object(GuzzleHttp\Psr7\Response), Array) #3 /home3/citycoll/public_html/infotec.pk/message/vendor/guzzlehttp/promises/src/TaskQueue.php(47): GuzzleHttp\Promise\Promise::GuzzleHttp\Promise\{closure}() #4 /home3/citycoll/public_html/infotec.pk/message/vendor/guzzlehttp/guzzle/src/Handler/CurlMultiHandler.php(98): GuzzleHttp\Promise\TaskQueue->run() #5 /home3/citycoll/public_html/infotec.pk/message/vendor/guzzlehttp/guzzle/src/Handler/CurlMultiHandler.php(125): GuzzleHttp\Handler\CurlMultiHandler->tick() #6 /home3/citycoll/public_html/infotec.pk/message/vendor/guzzlehttp/promises/src/Promise.php(246): GuzzleHttp\Handler\CurlMultiHandler->execute(true) #7 /home3/citycoll/public_html/infotec.pk/message/vendor/guzzlehttp/promises/src/Promise.php(223): GuzzleHttp\Promise\Promise->invokeWaitFn() #8 /home3/citycoll/public_html/infotec.pk/message/vendor/guzzlehttp/promises/src/Promise.php(267): GuzzleHttp\Promise\Promise->waitIfPending() #9 /home3/citycoll/public_html/infotec.pk/message/vendor/guzzlehttp/promises/src/Promise.php(225): GuzzleHttp\Promise\Promise->invokeWaitList() #10 /home3/citycoll/public_html/infotec.pk/message/vendor/guzzlehttp/promises/src/Promise.php(62): GuzzleHttp\Promise\Promise->waitIfPending() #11 /home3/citycoll/public_html/infotec.pk/message/vendor/guzzlehttp/promises/src/EachPromise.php(101): GuzzleHttp\Promise\Promise->wait() #12 /home3/citycoll/public_html/infotec.pk/message/vendor/guzzlehttp/promises/src/Promise.php(246): GuzzleHttp\Promise\EachPromise->GuzzleHttp\Promise\{closure}(true) #13 /home3/citycoll/public_html/infotec.pk/message/vendor/guzzlehttp/promises/src/Promise.php(223): GuzzleHttp\Promise\Promise->invokeWaitFn() #14 /home3/citycoll/public_html/infotec.pk/message/vendor/guzzlehttp/promises/src/Promise.php(267): GuzzleHttp\Promise\Promise->waitIfPending() #15 /home3/citycoll/public_html/infotec.pk/message/vendor/guzzlehttp/promises/src/Promise.php(225): GuzzleHttp\Promise\Promise->invokeWaitList() #16 /home3/citycoll/public_html/infotec.pk/message/vendor/guzzlehttp/promises/src/Promise.php(62): GuzzleHttp\Promise\Promise->waitIfPending() #17 /home3/citycoll/public_html/infotec.pk/message/model/Device.php(274): GuzzleHttp\Promise\Promise->wait() #18 /home3/citycoll/public_html/infotec.pk/message/model/Message.php(400): Device::processRequests(Array) #19 /home3/citycoll/public_html/infotec.pk/message/services/send.php(88): Message::sendMessages(Array, Object(User), Array, NULL) #20 {main}