Cognos Planning error

[amkale007]

We have Cognos 10.2 in our environment.
we are getting the below error while opening the Administrator panel.

Main form failed to initialize.

Error Details:
Unable to determine if the Planning tables exist in Content Manager. Please ensure the planning service is running.
Unexpected: missing HRESULT parameter.

steps taken:
1. Checked cognos and planning service on the server and it's working fine.

2. Tested Gateways URI and it's working fine as well. I have updated the URI again and restarted the services from the Cognos administrator as well.

3. Stopped Planning service > Kill Java from task manager > Start the service. It's still giving the error.

any help in this regard will be appreciated.