Get cert error on v0.27

We have to wait 10 seconds for the certificate to be issued…
Traceback (most recent call last):
File “management/ssl_certificates.py”, line 803, in
provision_certificates_cmdline()
File “management/ssl_certificates.py”, line 446, in provision_certificates_cmdline
status = provision_certificates(env, agree_to_tos_url=agree_to_tos_url, logger=my_logger, force_domains=force_domains, show_extended_problems=show_extended_problems)
File “management/ssl_certificates.py”, line 331, in provision_certificates
logger=my_logger)
File “/usr/local/lib/mailinabox/env/lib/python3.4/site-packages/free_tls_certificates/client.py”, line 64, in issue_certificate
agree_to_tos_url, validation_method, acme_server, logger)
File “/usr/local/lib/mailinabox/env/lib/python3.4/site-packages/free_tls_certificates/client.py”, line 121, in validate_domain_ownership
challg = submit_domain_validation(client, regr, account, challenges_file, domain, validation_method, logger)
File “/usr/local/lib/mailinabox/env/lib/python3.4/site-packages/free_tls_certificates/client.py”, line 433, in submit_domain_validation
message = '; '.join(c.error.detail for c in challg.challenges if c.status.name == “invalid”)
File “/usr/local/lib/mailinabox/env/lib/python3.4/site-packages/free_tls_certificates/client.py”, line 433, in
message = '; '.join(c.error.detail for c in challg.challenges if c.status.name == “invalid”)
AttributeError: ‘NoneType’ object has no attribute ‘detail’