Lets encrypt renewal error

Hello everyone.
When trying to renew / request the server hostname domain SSL certificate I get the following error… All other virtual servers’certificates are working correclty.

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Requesting a certificate for xxx.xxx, www.xxx.xxx 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 196, in get_crt log.error("{0} challenge did not pass: {1}".format(domain, challenge_status[‘error’][‘detail’])) UnicodeEncodeError: ‘ascii’ codec can’t encode characters in position 226-231: ordinal not in range(128) DNS-based validation failed : Failed to request certificate :
Gave up waiting for validation