This is my error.
AutoSSL: Issue Failed![Mon May 6 17:35:28 CEST 2019] Single domain='panel.betahostserver.com'
[Mon May 6 17:35:28 CEST 2019] Getting domain auth token for each domain
[Mon May 6 17:35:30 CEST 2019] Getting webroot for domain='panel.betahostserver.com'
[Mon May 6 17:35:30 CEST 2019] Verifying: panel.betahostserver.com
[Mon May 6 17:35:33 CEST 2019] Pending
[Mon May 6 17:35:36 CEST 2019] Pending
[Mon May 6 17:35:38 CEST 2019] Pending
[Mon May 6 17:35:40 CEST 2019] Pending
[Mon May 6 17:35:43 CEST 2019] Pending
[Mon May 6 17:35:46 CEST 2019] Pending
[Mon May 6 17:35:48 CEST 2019] Pending
[Mon May 6 17:35:51 CEST 2019] Pending
[Mon May 6 17:35:53 CEST 2019] panel.betahostserver.com:Verify error:DNS problem: SERVFAIL looking up CAA for betahostserver.com
[Mon May 6 17:35:53 CEST 2019] Please check log file for more details: /root/.acme.sh/acme.sh.log
In /root/.acme.sh/acme.sh.log is
[Mon May 6 17:35:53 CEST 2019] skip dns.
[Mon May 6 17:35:53 CEST 2019] _on_issue_err
[Mon May 6 17:35:53 CEST 2019] Please check log file for more details: /root/.acme.sh/acme.sh.log
[Mon May 6 17:35:53 CEST 2019] url='
https://acme-v02.api.letsencrypt.org/acme/challenge/SPH1oHvs_uQwKax9uN8DP4yoENli0itQYdwVG5LcuQE/15557108187'
[Mon May 6 17:35:53 CEST 2019] payload='{}'
[Mon May 6 17:35:53 CEST 2019] POST
[Mon May 6 17:35:53 CEST 2019] _post_url='
https://acme-v02.api.letsencrypt.org/acme/challenge/SPH1oHvs_uQwKax9uN8DP4yoENli0itQYdwVG5LcuQE/15557108187'
[Mon May 6 17:35:53 CEST 2019] _CURL='curl -L --silent --dump-header /root/.acme.sh/http.header -g '
[Mon May 6 17:35:54 CEST 2019] _ret='0'
[Mon May 6 17:35:54 CEST 2019] code='400'