Unable to access the configuration object : REST API failure, code : 500

I try to start gwcli after adding two iSCSI VM to a running cluster. With the first install it was working up to the point where I started adding the gateways. The command was hanging and I had to kill it. Since then I get the above error when starting gwcli

[root@duscephiscsi1 ceph]# gwcli -d
Adding ceph cluster 'ceph' to the UI
Fetching ceph osd information
Querying ceph for state information
**Unable to access the configuration object : REST API failure, code : 500
GatewayError:**
Traceback (most recent call last):
File "/usr/bin/gwcli", line 194, in
main()
File "/usr/bin/gwcli", line 105, in main
root_node.refresh()
File "/usr/lib/python3.6/site-packages/gwcli/gateway.py", line 84, in refresh
raise GatewayError
gwcli.utils.GatewayError

tcmu, rbd-target-* process are all running on all hosts. Nothing in log files for tcmu, rbd-target-* or messages. Using RHEL 8.2 with RH Ceph Storage 4.1.

Appreciate your help. Thanks.