Usermin not currently running, Failed to install wordpress and Requesting a certificate failed

I added new domain name. Domain added but I have this message:

Re-starting Usermin not currently running

After, I try to install wordPress but I have this message:

Failed to install script : Download of http://scripts.virtualmin.com:80/wordpress-5.1.1.zip failed : HTTP/1.1 404 Not Found

And finaly I try to install certificate but I have this message

Request Certificate
In domain bazaar.autos
Requesting a certificate for bazaar.autos, www.bazaar.autos, autoconfig.bazaar.autos, autodiscover.bazaar.autos from Let’s Encrypt …
… request failed : Web-based validation failed : Failed to request certificate :
Traceback (most recent call last):
File “/usr/libexec/webmin/webmin/acme_tiny.py”, line 250, in
main(sys.argv[1:])

File “/usr/libexec/webmin/webmin/acme_tiny.py”, line 246, in main
signed_crt = get_crt(args.account_key, args.csr, args.acme_dir, args.dns_hook, args.cleanup_hook, log=LOGGER, CA=args.ca)
File “/usr/libexec/webmin/webmin/acme_tiny.py”, line 107, in get_crt
“agreement”: “https://letsencrypt.org/documents/LE-SA-v1.2-November-15-2017.pdf”,
File “/usr/libexec/webmin/webmin/acme_tiny.py”, line 63, in _send_signed_request
protected[“nonce”] = urlopen(CA + “/directory”).headers[‘Replay-Nonce’]
File “/usr/lib64/python2.7/urllib2.py”, line 154, in urlopen
return opener.open(url, data, timeout)
File “/usr/lib64/python2.7/urllib2.py”, line 431, in open
response = self._open(req, data)
File “/usr/lib64/python2.7/urllib2.py”, line 449, in _open
‘_open’, req)
File “/usr/lib64/python2.7/urllib2.py”, line 409, in _call_chain
result = func(*args)
File “/usr/lib64/python2.7/urllib2.py”, line 1258, in https_open
context=self._context, check_hostname=self._check_hostname)
File “/usr/lib64/python2.7/urllib2.py”, line 1214, in do_open
raise URLError(err)
urllib2.URLError: <urlopen error [Errno -2] Name or service not known>
DNS-based validation failed : Failed to request certificate :
Traceback (most recent call last):
File “/usr/libexec/webmin/webmin/acme_tiny.py”, line 250, in
main(sys.argv[1:])
File “/usr/libexec/webmin/webmin/acme_tiny.py”, line 246, in main
signed_crt = get_crt(args.account_key, args.csr, args.acme_dir, args.dns_hook, args.cleanup_hook, log=LOGGER, CA=args.ca)
File “/usr/libexec/webmin/webmin/acme_tiny.py”, line 107, in get_crt
“agreement”: “https://letsencrypt.org/documents/LE-SA-v1.2-November-15-2017.pdf”,
File “/usr/libexec/webmin/webmin/acme_tiny.py”, line 63, in _send_signed_request
protected[“nonce”] = urlopen(CA + “/directory”).headers[‘Replay-Nonce’]
File “/usr/lib64/python2.7/urllib2.py”, line 154, in urlopen
return opener.open(url, data, timeout)
File “/usr/lib64/python2.7/urllib2.py”, line 431, in open
response = self._open(req, data)
File “/usr/lib64/python2.7/urllib2.py”, line 449, in _open
‘_open’, req)
File “/usr/lib64/python2.7/urllib2.py”, line 409, in _call_chain
result = func(*args)
File “/usr/lib64/python2.7/urllib2.py”, line 1258, in https_open
context=self._context, check_hostname=self._check_hostname)
File “/usr/lib64/python2.7/urllib2.py”, line 1214, in do_open
raise URLError(err)
urllib2.URLError: <urlopen error [Errno -2] Name or service not known>

My system and VPS

Operating system CentOS Linux 7.6.1810
Webmin version 1.900
Usermin version 1.751
Virtualmin version 6.06
Kernel and CPU
Linux 3.10.0-957.10.1.el7.x86_64 on x86_64
Processor information Intel® Xeon® CPU E5-2620 v2 @ 2.10GHz, 6 cores
Running processes 222 CPU load averages 1.04 (1 min) 0.41 (5 mins) 0.31 (15 mins)
Real memory 2.54 GB used / 15.15 GB total
Local disk space 35.73 GB used / 259.42 GB free / 295.15 GB total
Package updates All installed packages are up to date