I have found a solution for the problem. There should be some permission changes happened in the Qlik new version in compared to the older version which i was using. This product change is not documented anywhere. So i am assuming that is the cause. I am not completely sure on that.
My solution was to create a security rule which gives the access to the Stream,app, app objects and Data connections. In the earlier version i had only File upload read access. But for the new version in the explicit rule i have created with the update permission as well.