Symphony Bug Fixes

I have an android app, actually I am getting an issue in the backend server of my app. Whenever I send notification to my app, my backend server (which is based on symphony) got some issue. When I talked to the customer support of my Hosting provider then they told me this thing : PHP Warning: count(): Parameter must be an array or an object that implements Countable in vendor/symfony/symfony/src/Symfony/Component/Validator/Validator/[login to view URL] on line 749 As per the error logs, the issue is with the mentioned file content which might be causing the website to go on the above page temporarily, it is an issue with some script that needs to be checked by a developer, apart from this I was unable to locate any server end issue.