syntax error, unexpected '=>' (T_DOUBLE_ARROW), expecting ')' in /var/www/nextcloud/apps/mediadc/lib/Service/CollectorService.php:177

[GrumpyMeow]

Describe the bug
Yesterday I've installed the mediadc-app in my Nextcloud installation just after i'd upgraded to v21.0.5.
When i browse to my Nextcloud-web i receive an generic error screen.
To fix the error i tried to run: sudo -u www-data php occ upgrade

To Reproduce
Steps to reproduce the behavior:

1. Install mediadc app in Nextcloud v21.0.5
2. Run: sudo -u www-data php occ upgrade
3. See error in console

Expected behavior
I didn't expect to see an error about the Mediadc-app
I was able to revive my nextcloud instance by mv apps/mediadc apps/mediadc.old

Screenshots
If applicable, add screenshots to help explain your problem.

Desktop (please complete the following information):

• OS: Proxmox VE 7, Turnkey LXC container
• Nextcloud version: v21.0.5
• MediaDC version: v0.1.2

Additional context

root@nextcloud .../www/nextcloud# sudo -u www-data php occ upgrade
An unhandled exception has been thrown:
ParseError: syntax error, unexpected '=>' (T_DOUBLE_ARROW), expecting ')' in /var/www/nextcloud/apps/mediadc/lib/Service/CollectorService.php:177
Stack trace:
#0 /var/www/nextcloud/lib/composer/composer/ClassLoader.php(346): Composer\Autoload\includeFile('/var/www/nextcl...')
#1 [internal function]: Composer\Autoload\ClassLoader->loadClass('OCA\\MediaDC\\Ser...')
#2 [internal function]: spl_autoload_call('OCA\\MediaDC\\Ser...')
#3 /var/www/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php(107): ReflectionClass->__construct('OCA\\MediaDC\\Ser...')
#4 /var/www/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php(126): OC\AppFramework\Utility\SimpleContainer->resolve('OCA\\MediaDC\\Ser...')
#5 /var/www/nextcloud/lib/private/AppFramework/DependencyInjection/DIContainer.php(459): OC\AppFramework\Utility\SimpleContainer->query('OCA\\MediaDC\\Ser...')
#6 /var/www/nextcloud/lib/private/AppFramework/DependencyInjection/DIContainer.php(431): OC\AppFramework\DependencyInjection\DIContainer->queryNoFallback('OCA\\MediaDC\\Ser...')
#7 /var/www/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php(87): OC\AppFramework\DependencyInjection\DIContainer->query('OCA\\MediaDC\\Ser...', true)
#8 [internal function]: OC\AppFramework\Utility\SimpleContainer->OC\AppFramework\Utility\{closure}(Object(ReflectionParameter))
#9 /var/www/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php(101): array_map(Object(Closure), Array)
#10 /var/www/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php(109): OC\AppFramework\Utility\SimpleContainer->buildClass(Object(ReflectionClass))
#11 /var/www/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php(126): OC\AppFramework\Utility\SimpleContainer->resolve('OCA\\MediaDC\\Com...')
#12 /var/www/nextcloud/lib/private/AppFramework/DependencyInjection/DIContainer.php(459): OC\AppFramework\Utility\SimpleContainer->query('OCA\\MediaDC\\Com...')
#13 /var/www/nextcloud/lib/private/ServerContainer.php(146): OC\AppFramework\DependencyInjection\DIContainer->queryNoFallback('OCA\\MediaDC\\Com...')
#14 /var/www/nextcloud/lib/private/Console/Application.php(221): OC\ServerContainer->query('OCA\\MediaDC\\Com...')
#15 /var/www/nextcloud/lib/private/Console/Application.php(136): OC\Console\Application->loadCommandsFromInfoXml(Array)
#16 /var/www/nextcloud/console.php(99): OC\Console\Application->loadCommands(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
#17 /var/www/nextcloud/occ(11): require_once('/var/www/nextcl...')

#18 {main}root@nextcloud .../www/nextcloud# php -v
PHP 7.3.29-1~deb10u1 (cli) (built: Jul  2 2021 04:04:33) ( NTS )
Copyright (c) 1997-2018 The PHP Group
Zend Engine v3.3.29, Copyright (c) 1998-2018 Zend Technologies
    with Zend OPcache v7.3.29-1~deb10u1, Copyright (c) 1999-2018, by Zend Technologies

[andrey18106]

Hi, thanks for your bug report.

That syntax error occurred because we are using some new PHP features that are available since PHP version 7.4 (that is described in requirements here. So you should upgrade your PHP to 7.4 or higher.

May be we'll rewrite code to support PHP 7.3 in a future updates.

[bigcat88]

Good catch, we missed php dependency in app/info.xml file with required version.

[andrey18106]

@GrumpyMeow Closed issue due to inactivity. Have you tested different PHP version (7.4+)?