Log-in issue after migrating to V7 platform

Hi
I have migrated my application to the Platform version 7.0, but failed in log-in. After I have entered by log-in credentials correctly I am getting the following error:

image

Do I need to define a root screen in V7, How?

regards

There should be an exception in server log which is a root cause of the problem.

Thanks, solved the issue, the problem was in the sideMenu.

Could you tell me how to solve this problem´╝îThanks!

There was another exception caused the reported exception. Please check what is the primary exception.