[System Test] status 500 returned by completeJoin REST API

[2021-03-23T00:52:59-07:00, sequoiatools/couchbase-cli:7.0:32742d] server-add -c 172.23.97.74:8091 --server-add https://172.23.106.136 -u Administrator -p password --server-add-username Administrator --server-add-password password --services index

→  

Error occurred on container - sequoiatools/couchbase-cli:7.0:[server-add -c 172.23.97.74:8091 --server-add https://172.23.106.136 -u Administrator -p password --server-add-username Administrator --server-add-password password --services index]

docker logs 32742d

docker start 32742d

�ERROR: Join completion call failed. Got HTTP status 500 from REST call post to https://172.23.106.136:18091/completeJoin. Body was: "[\"Unexpected server error, request logged.\"]"

./diag.log:2021-03-23T00:53:01.294-07:00, ns_cluster:5:info:message(ns_1@172.23.97.74) - Failed to add node 172.23.106.136:18091 to cluster. Join completion call failed. Got HTTP status 500 from REST call post to https://172.23.106.136:18091/completeJoin. Body was: "[\"Unexpected server error, request logged.\"]"

./ns_server.debug.log:       <<"Got HTTP status 500 from REST call post to https://172.23.106.136:18091/completeJoin. Body was: \"[\\\"Unexpected server error, request logged.\\\"]\"">>,

./ns_server.debug.log:       {bad_status,500,<<"[\"Unexpected server error, request logged.\"]">>}}

./ns_server.debug.log:                                                            <<"Join completion call failed. Got HTTP status 500 from REST call post to https://172.23.106.136:18091/completeJoin. Body was: \"[\\\"Unexpected server error, request logged.\\\"]\"">>}

./ns_server.debug.log:                                                          <<"Join completion call failed. Got HTTP status 500 from REST call post to https://172.23.106.136:18091/completeJoin. Body was: \"[\\\"Unexpected server error, request logged.\\\"]\"">>}

./ns_server.debug.log:[user:info,2021-03-23T00:53:01.294-07:00,ns_1@172.23.97.74:<0.19778.311>:ns_cluster:add_node_to_group:89]Failed to add node 172.23.106.136:18091 to cluster. Join completion call failed. Got HTTP status 500 from REST call post to https://172.23.106.136:18091/completeJoin. Body was: "[\"Unexpected server error, request logged.\"]"