internal server error

==== Required information ====
- iRedMail version: 1.9.2
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): MySQL
- Web server (Apache or Nginx): Nginx
- Linux/BSD distribution name and version: Ubuntu 14.04
- Related log if you're reporting an issue:
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I am getting "internal server error" when i open link https://<url>/iredadmin/aliases/<domain>. Is there a way to debug this issue?

Thanks