Error in opening Groups

Document ID : KB000098933
Last Modified Date : 01/06/2018
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When I tried to open Administration --> Groups, I am facing the attached error.

Screenshot shows a popup message: 
RSL Error 3 of 3 
At the bottom of the page it says: 
Failed to load error #2032

I have checked couple of other tabs and they all are working fine.
Can you please help me with it.
CAPM 3.x
Make sure the item and group caches are free from corruption by clearing them.
Run this in a shell.
Replace the value CAPCHOST with your hostname or IP.
If needed, replace admin:admin with your admin user name and password.
* Invalidate (clear) the ITEM Cache: 
curl -v -X PUT -H 'Content-Type: application/xml' -d '</emptybody>' -u admin:admin http://CAPCHOST:8181/pc/center/webservice/invalcache/ITEM 
* Invalidate (clear) the GROUP Cache: 
curl -v -X PUT -H 'Content-Type: application/xml' -d '</emptybody>' -u admin:admin http://CAPCHOST:8181/pc/center/webservice/invalcache/GROUP 
refresh the view or query.