Issue Cron /usr/lib/mailman/cron/gate_news sending mails every 5 minute

[JohanA]

Hi!

Today all of a sudden I started to receive emails every 5 minute from "Cron Daemon" with the following subject:

"Cron <mailman@domain.com> /usr/lib/mailman/cron/gate_news"

Sent to: mailman@domain.com

With the following text body of the email:
"
Traceback (most recent call last):
File "/usr/lib/mailman/cron/gate_news", line 44, in <module>
from Mailman import MailList
File "/usr/lib/mailman/Mailman/MailList.py", line 51, in <module>
from Mailman.Archiver import Archiver
File "/usr/lib/mailman/Mailman/Archiver/__init__.py", line 17, in <module>
from Archiver import *
File "/usr/lib/mailman/Mailman/Archiver/Archiver.py", line 37, in <module>
from Mailman.i18n import _
File "/usr/lib/mailman/Mailman/i18n.py", line 36, in <module>
_ctype_charset = _get_ctype_charset()
File "/usr/lib/mailman/Mailman/i18n.py", line 31, in _get_ctype_charset
old = locale.setlocale(locale.LC_CTYPE, '')
File "/usr/lib64/python2.6/locale.py", line 513, in setlocale
return _setlocale(category, locale)
locale.Error: unsupported locale setting"

So it seems to be something about locate settings? Or..?
I have tried to find an answer everywhere on different forums and spent several hours with the hosting support team. But nothing seems to work...
And the emails every 5 min just keep coming...

I haven't done any changes lately or have none custom cron jobs running. The server has been running for 10 years without this kind of issue.
So I'm pretty clueless. Hopefully someone here might know the problem

The server:
Plesk Onyx v17.8.11_build1708180301.19 os_CentOS 6

Many thanks!
//Johan