==== REQUIRED BASIC INFO OF YOUR IREDMAIL SERVER ====
- iRedMail version (check /etc/iredmail-release): iRedMail-1.3.1
- Deployed with iRedMail Easy or the downloadable installer?
- Linux/BSD distribution name and version: BSD 12
- Store mail accounts in which backend (LDAP/MySQL/PGSQL):  postgesql
- Web server (Apache or Nginx): nginx
- Manage mail accounts with iRedAdmin-Pro?
- [IMPORTANT] Related original log or error message is required if you're experiencing an issue.
====

Hello everyone. Installed without problems. In mydomen.ru/mail I go without problems, but when trying to go to iredadmin I get an internal server error.
And cron daemon sends these messages:

Cron <root@mail> /usr/local/bin/python2 /usr/local/www/iredadmin/tools/delete_mailboxes.py
Фото контакта
От Cron Daemon <root@mail.mydomen.ru> за 2020-08-10 13:01
Подробности
<<< ERROR >>> Cannot connect to SQL database, aborted. Error: TypeError("cannot concatenate 'str' and 'exceptions.ImportError' objects",)

i don't know how to fix the error. Do you have any thoughts?
Thanks.