[SOGo] Error when install ssl lets'encrypt

[Maximo Monsalvo]

Hi i have sogo install on ubuntu 16.04 server, sogo 4.3 version and self 
signed certificate, when i install lets-encrypt the login page looks 
like this attached, if i remove lets-encrypt page from login looks 
correct again Can you help me with this?

--
users@sogo.nu
https://inverse.ca/sogo/lists