Cannot create a databag, pool 'sqerl' failed to start member:

I have a Chef Cluster

$ knife data bag create --secret-file data_bag_secret_key s3cmd s3cfg

getting error:
ERROR: Server returned error 503 for https://chef-dt-frontend.com/organizations/spacewalkprod/data/s3cmd, retrying 1/5 in 4s

I looked at $tail -f /var/log/opscode/opscode-erchef/current
2018-05-01_11:08:36.24001 [error] pool ‘sqerl’ failed to start member: {error,sock_closed}
2018-05-01_11:08:36.27454 [error] gen_server <0.15146.838> terminated with reason: sock_closed
2018-05-01_11:08:36.27586 [error] CRASH REPORT Process <0.15146.838> with 1 neighbours exited with reason: sock_closed in gen_server:terminate/7 line 826
2018-05-01_11:08:36.27693 [error] pool ‘sqerl’ failed to start member: {error,sock_closed}
2018-05-01_11:08:36.30927 [error] gen_server <0.15147.838> terminated with reason: sock_closed
2018-05-01_11:08:36.31070 [error] CRASH REPORT Process <0.15147.838> with 1 neighbours exited with reason: sock_closed in gen_server:terminate/7 line 826
2018-05-01_11:08:36.31206 [error] pool ‘sqerl’ failed to start member:

wht is the solution ??