Hello Ankush,
I see many messages like,
INFO: Adding certificate
SEVERE: Error importing new certifiate
Can you provide more details about what had been done?
Are you trying to use client certificate to login?
You may try one of following,
1. login with username/password
2. change another port, on login window, input gateway host like,
<gatway host name >:9443
3. move the file C:\Users\<user>\.l7tech\trustStore to another backup folder, restart policy manager, and login again
Regards,
Mark