Microk8s join error: Command returned non-zero exit status 1

Hello, I tried to run microk8s join from the second node, but got an error:

[root@mdxk8s02 yum.repos.d]# sudo microk8s join 172.16.11.93:25000/386caba0b230bce149c1d4a02004a42d/d43fcd39ed1c --worker
Contacting cluster at 172.16.11.93
Traceback (most recent call last):
  File "/snap/microk8s/4595/scripts/wrappers/join.py", line 981, in <module>
    join(prog_name="microk8s join")
  File "/snap/microk8s/4595/usr/lib/python3/dist-packages/click/core.py", line 722, in __call__
    return self.main(*args, **kwargs)
  File "/snap/microk8s/4595/usr/lib/python3/dist-packages/click/core.py", line 697, in main
    rv = self.invoke(ctx)
  File "/snap/microk8s/4595/usr/lib/python3/dist-packages/click/core.py", line 895, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/snap/microk8s/4595/usr/lib/python3/dist-packages/click/core.py", line 535, in invoke
    return callback(*args, **kwargs)
  File "/snap/microk8s/4595/scripts/wrappers/join.py", line 974, in join
    join_dqlite(connection_parts, verify, worker)
  File "/snap/microk8s/4595/scripts/wrappers/join.py", line 766, in join_dqlite
    join_dqlite_worker_node(info, master_ip, master_port, token)
  File "/snap/microk8s/4595/scripts/wrappers/join.py", line 834, in join_dqlite_worker_node
    update_cert_auth_kubeproxy(token, info["ca"], master_ip, master_port, hostname_override)
  File "/snap/microk8s/4595/scripts/wrappers/join.py", line 427, in update_cert_auth_kubeproxy
    cert = get_client_cert(master_ip, master_port, "kube-proxy", proxy_token, "system:kube-proxy")
  File "/snap/microk8s/4595/scripts/wrappers/join.py", line 281, in get_client_cert
    subprocess.check_call(cmd_cert.split(), stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
  File "/snap/microk8s/4595/usr/lib/python3.6/subprocess.py", line 311, in check_call
    raise CalledProcessError(retcode, cmd)
subprocess.CalledProcessError: Command '['/snap/microk8s/4595/usr/bin/openssl', 'req', '-new', '-sha256', '-key', '/var/snap/microk8s/current/certs/kube-proxy.key', '-out', '/var/snap/microk8s/current/certs/kube-proxy.csr', '-subj', '/CN=system:kube-proxy']' returned non-zero exit status 1.