https://www.dropbox.com/s/wuu1lvc1uayf37t/fml-server-latest.log?dl=0
When upgrading from 1182 to 1187, we started getting this crash. Deleting permissions file does nothing to solve it.
https://www.dropbox.com/s/ug3518juc7t1cl6/permissions.json?dl=0
permission file report too.

The one with duplicate users in permissions has been fixed afaik.
So which issue is left here now?

So what was the issue?

Found that Clay Soldiers mod doesn't like FE, so had to take out the clay soldiers mod for the server not to crash each load up.

Sounds like a mod compatibility bug. Can you confirm that the same version of clay solders worked fine in 1182?

@MikoSphinx Did clay solders work fine with 1182?

We have not tried in that version but decided not to have it in the modpack right now.

We just had a recent crash on the server though https://www.dropbox.com/s/rardnu8hi8hcxmq/Crash%20Report%207.19.16.txt?dl=0

Then the backups from the server as well https://www.dropbox.com/s/wuu1lvc1uayf37t/fml-server-latest.log?dl=0 https://www.dropbox.com/s/ug3518juc7t1cl6/permissions.json?dl=0

Seems too that the NPCs duplicates issue hasn't been completely solved for 1187 version.

Original issue WAS clay soldiers.
Current issue is the npc duplicates bug in permissions.

This last one probably should've been in a separate thread.

We are still working on the duplicate bug. @olee Did not like the first fix I made cause it was too aggressive, so we are working on a less intrusive fix. See #2103 and 6685923. As for your original crash report, it looks like it was caused by a conflicting mixin, but no mixins were changed in between the two updates.

Good to know.
I'll keep an eye out for updates. :-)