Apache2 won't start after installing ISPConifg 3

-- Logs begin at Sat 2018-11-24 18:56:15 UTC, end at Sun 2018-11-25 09:56:42 UTC. --
Nov 25 09:56:42 domain.example.tld apache2[5469]: The apache2 configtest failed. ... (warning).
Nov 25 09:56:42 domain.example.tld apache2[5469]: Output of config test was:
Nov 25 09:56:42 domain.example.tld apache2[5469]: AH00526: Syntax error on line 106 of /etc/apache2/conf-enabled/roundcube.conf:
Nov 25 09:56:42 domain.example.tld apache2[5469]: SSLCertificateFile: file '/usr/local/ispconfig/interface/ssl/ispserver.crt' does not exist or is empty
Nov 25 09:56:42 domain.example.tld apache2[5469]: Action 'configtest' failed.
Nov 25 09:56:42 domain.example.tld apache2[5469]: The Apache error log may have more information.
Nov 25 09:56:42 domain.example.tld systemd[1]: apache2.service: control process exited, code=exited status=1
Nov 25 09:56:42 domain.example.tld systemd[1]: Failed to start LSB: Apache2 web server.
-- Subject: Unit apache2.service has failed
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
--
-- Unit apache2.service has failed.
--
-- The result is failed.
Nov 25 09:56:42 srv01.aguila

 

Fix the syntax error in line number 106.

 

The line prints this:
SSLCertificateFile /usr/local/ispconfig/interface/ssl/ispserver.crt
it looks fine to me but as the error says ispserver.crt is empty

 

Regenerating the SSL certificate solved the issue