How do i install firebase on heroku successfully? - php

Question

I have the following code that is working perfectly on my local machine.
<?php
header("Content-Type:application/json");
require __DIR__.'/vendor/autoload.php';
use Kreait\Firebase\Factory;
use Kreait\Firebase\ServiceAccount;
// This assumes that you have placed the Firebase credentials in the same directory
// as this PHP file.
$serviceAccount = ServiceAccount::fromJsonFile(__DIR__.'/xxxx-xxxxx-xxxxxxxxxxxxx.json');
$firebase = (new Factory)
->withServiceAccount($serviceAccount)
->create();
$database = $firebase->getDatabase();
$newPost = $database
->getReference('blog/posts')
->push([
'title' => 'Post title',
'body' => 'This should probably be longer.'
]);
echo($newPost->getKey());
echo '{"ResultCode":0,"ResultDesc":"Confirmation received successfully"}';
?>
But When i upload the same code to heroku app and try to run the file url,i get a 500http error
What would i have forgotten. Because ive tried looking for a solution online but none has really helped. Ive tried reinstalling dependencies but still having the same problem.
The Following is my heroku logs error when i tried running the app today morning.
2018-10-27T05:15:35.613487+00:00 heroku[web.1]: Unidling
2018-10-27T05:15:35.613848+00:00 heroku[web.1]: State changed from down to starting
2018-10-27T05:15:37.230016+00:00 heroku[web.1]: Starting process with command `heroku-php-apache2`
2018-10-27T05:15:39.635790+00:00 app[web.1]: Optimizing defaults for 1X dyno...
2018-10-27T05:15:39.776372+00:00 app[web.1]: 4 processes at 128MB memory limit.
2018-10-27T05:15:39.781273+00:00 app[web.1]: Starting php-fpm...
2018-10-27T05:15:41.783183+00:00 app[web.1]: Starting httpd...
2018-10-27T05:15:41.925232+00:00 heroku[web.1]: State changed from starting to up
2018-10-27T05:15:43.694660+00:00 heroku[router]: at=info method=GET path="/rGU7qCmigsrVL4SuYNS01/conf irmation.php" host=cryptic-forest-94367.herokuapp.com request_id=cda944ce-b0ea-4cda-92f9-cba7c9b1c3e5 fwd="196.207.150.137" dyno=web.1 connect=0ms service=6ms status=500 bytes=161 protocol=https
2018-10-27T05:15:43.694391+00:00 app[web.1]: [27-Oct-2018 05:15:43 UTC] PHP Warning: require(/app/rG U7qCmigsrVL4SuYNS01/vendor/composer/../guzzlehttp/psr7/src/functions_include.php): failed to open str eam: No such file or directory in /app/rGU7qCmigsrVL4SuYNS01/vendor/composer/autoload_real.php on lin e 66
2018-10-27T05:15:43.695104+00:00 app[web.1]: [27-Oct-2018 05:15:43 UTC] PHP Fatal error: require(): Failed opening required '/app/rGU7qCmigsrVL4SuYNS01/vendor/composer/../guzzlehttp/psr7/src/functions_ include.php' (include_path='.:/app/.heroku/php/lib/php') in /app/rGU7qCmigsrVL4SuYNS01/vendor/compose r/autoload_real.php on line 66
2018-10-27T05:15:43.695646+00:00 app[web.1]: 10.5.165.56 - - [27/Oct/2018:05:15:43 +0000] "GET /rGU7q CmigsrVL4SuYNS01/confirmation.php HTTP/1.1" 500 - "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) Appl eWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Safari/537.36