Issue with VideoConverter v0.1.4 and Nextcloud v18.0.7

[RodSeq]

Hi, I have installed VideoConverter v0.1.4 on a freshly new instance Nextcloud v18.0.7. The app fails to work out of the box displaying the following error message:

B/var/www/vhosts/[mydomain]/httpdocs/nextcloud/apps/video_converter/lib/Controller/ConversionController.php(227): OC\Files\Utils\Scanner->scan('/rsequeira/file...', false) #1 /var/www/vhosts/[mydomain]/httpdocs/nextcloud/apps/video_converter/lib/Controller/ConversionController.php(98): OCA\Video_Converter\Controller\ConversionController->scanFolder('/rsequeira/file...', 'rsequeira') #2 /var/www/vhosts/[mydomain]/httpdocs/nextcloud/lib/private/AppFramework/Http/Dispatcher.php(170): OCA\Video_Converter\Controller\ConversionController->convertHere('Nextcloud intro...', '/', '0', 'avi', 'medium', '0', '', '', '', false, NULL, 0) #3 /var/www/vhosts/[mydomain]/httpdocs/nextcloud/lib/private/AppFramework/Http/Dispatcher.php(99): OC\AppFramework\Http\Dispatcher->executeController(Object(OCA\Video_Converter\Controller\ConversionController), 'convertHere') #4 /var/www/vhosts/[mydomain]/httpdocs/nextcloud/lib/private/AppFramework/App.php(125): OC\AppFramework\Http\Dispatcher->dispatch(Object(OCA\Video_Converter\Controller\ConversionController), 'convertHere') #5 /var/www/vhosts/[mydomain]/httpdocs/nextcloud/lib/private/AppFramework/Routing/RouteActionHandler.php(47): OC\AppFramework\App::main('OCA\Video_conve...', 'convertHere', Object(OC\AppFramework\DependencyInjection\DIContainer), Array) #6 [internal function]: OC\AppFramework\Routing\RouteActionHandler->__invoke(Array) #7 /var/www/vhosts/[mydomain]/httpdocs/nextcloud/lib/private/Route/Router.php(299): call_user_func(Object(OC\AppFramework\Routing\RouteActionHandler), Array) #8 /var/www/vhosts/[mydomain]/httpdocs/nextcloud/lib/base.php(1008): OC\Route\Router->match('/apps/video_con...') #9 /var/www/vhosts/[mydomain]/httpdocs/nextcloud/index.php(38): OC::handleRequest() #10 {main}

Could you tell me what should I do to solve this issue ?

Otherwise thanks for developping this app that is highly useful.

Thanks,
Rodolphe