Error creating new authz problem

I tried to apply for a certificate, but the error was as follows

2015-11-04 12:38:41,316:INFO:requests.packages.urllib3.connectionpool:Starting new HTTPS connection (1): acme-v01.api.letsencrypt.org
2015-11-04 12:38:43,714:DEBUG:requests.packages.urllib3.connectionpool:“POST /acme/new-authz HTTP/1.1” 500 76
2015-11-04 12:38:43,717:DEBUG:root:Received <Response [500]>. Headers: {‘Content-Length’: ‘76’, ‘Expires’: ‘Wed, 04 Nov 2015 04:38:43 GMT’, ‘Server’: ‘nginx’, ‘Connection’: ‘close’, ‘Pragma’: ‘no-cache’, ‘Cache-Control’: ‘max-age=0, no-cache, no-store’, ‘Date’: ‘Wed, 04 Nov 2015 04:38:43 GMT’, ‘Content-Type’: ‘application/problem+json’, ‘Replay-Nonce’: ‘D7-JbMciSSQTPpL8L3_2KOwUIBWAKf7bjstlPtTFqWA’}. Content: '{“type”:“urn:acme:error:serverInternal”,“detail”:“Error creating new authz”}'
2015-11-04 12:38:43,718:DEBUG:acme.client:Storing nonce: '\x0f\xbf\x89l\xc7"I$\x13>\x92\xfc/\x7f\xf6(\xec\x14 \x15\x80)\xfe\xdb\x8e\xcbe>\xd4\xc5\xa9`'
2015-11-04 12:38:43,718:DEBUG:acme.client:Received response <Response [500]> (headers: {‘Content-Length’: ‘76’, ‘Expires’: ‘Wed, 04 Nov 2015 04:38:43 GMT’, ‘Server’: ‘nginx’, ‘Connection’: ‘close’, ‘Pragma’: ‘no-cache’, ‘Cache-Control’: ‘max-age=0, no-cache, no-store’, ‘Date’: ‘Wed, 04 Nov 2015 04:38:43 GMT’, ‘Content-Type’: ‘application/problem+json’, ‘Replay-Nonce’: ‘D7-JbMciSSQTPpL8L3_2KOwUIBWAKf7bjstlPtTFqWA’}): '{“type”:“urn:acme:error:serverInternal”,“detail”:“Error creating new authz”}'
2015-11-04 12:38:43,719:DEBUG:letsencrypt.cli:Exiting abnormally:
Traceback (most recent call last):
File “/root/.local/share/letsencrypt/bin/letsencrypt”, line 11, in
sys.exit(main())
File “/root/.local/share/letsencrypt/lib/python2.7/site-packages/letsencrypt/cli.py”, line 1131, in main
return args.func(args, config, plugins)
File “/root/.local/share/letsencrypt/lib/python2.7/site-packages/letsencrypt/cli.py”, line 489, in obtaincert
_auth_from_domains(le_client, config, domains, plugins)
File “/root/.local/share/letsencrypt/lib/python2.7/site-packages/letsencrypt/cli.py”, line 327, in _auth_from_domains
lineage = le_client.obtain_and_enroll_certificate(domains, plugins)
File “/root/.local/share/letsencrypt/lib/python2.7/site-packages/letsencrypt/client.py”, line 229, in obtain_and_enroll_certificate
certr, chain, key, _ = self.obtain_certificate(domains)
File “/root/.local/share/letsencrypt/lib/python2.7/site-packages/letsencrypt/client.py”, line 212, in obtain_certificate
return self._obtain_certificate(domains, csr) + (key, csr)
File “/root/.local/share/letsencrypt/lib/python2.7/site-packages/letsencrypt/client.py”, line 170, in _obtain_certificate
authzr = self.auth_handler.get_authorizations(domains)
File “/root/.local/share/letsencrypt/lib/python2.7/site-packages/letsencrypt/auth_handler.py”, line 74, in get_authorizations
domain, self.account.regr.new_authzr_uri)
File “/root/.local/share/letsencrypt/lib/python2.7/site-packages/acme/client.py”, line 215, in request_domain_challenges
typ=messages.IDENTIFIER_FQDN, value=domain), new_authz_uri)
File “/root/.local/share/letsencrypt/lib/python2.7/site-packages/acme/client.py”, line 195, in request_challenges
response = self.net.post(new_authzr_uri, new_authz)
File “/root/.local/share/letsencrypt/lib/python2.7/site-packages/acme/client.py”, line 624, in post
return self._check_response(response, content_type=content_type)
File “/root/.local/share/letsencrypt/lib/python2.7/site-packages/acme/client.py”, line 542, in _check_response
raise messages.Error.from_json(jobj)
Error: serverInternal :: The server experienced an internal error :: Error creating new authz

An unexpected error occurred.
Error: serverInternal :: The server experienced an internal error :: Error creating new authz
Please see the logfiles in /var/log/letsencrypt for more details.

Complete log: https://www.gehaowu.com/logs/letsencrypt.log.txt