Hi,
the mod worked fine for a long time, but at some point I get the error message (unfortunetaly in half german):

Die Mod Pyanodons AlienLife (2.0.0) hat einen Fehler verursacht, der nicht behoben werden kann.
Bitte informiere den Autor der Mod über diesen Fehler.

Error while running event pyalienlife::on_gui_opened (ID 88)
Unknown item name: zipir
stack traceback:
[C]: in function 'add'
pyalienlife/control.lua:142: in function 'create_sh_animal_table'
pyalienlife/control.lua:180: in function 'create_slaughterhouse_gui'
pyalienlife/control.lua:668: in function <pyalienlife/control.lua:654>

This happens when placing a slaughterhouse MK01, although it worked in the past. I just placed it and clicked on it, before selecting a recipy.

Is this known? How can I overcome this issue?

Many thanks

are you using newest mod versions?

I am using AlienLife + AlienLife Graphics 1 to 3 all in version 2.0.0.
Be aware that this was not the first slaughterhouse I have placed. All before went fine.

Do you recommend to update the mods? I hope this will not mess up my game save.

2.0 is over 1 year old: https://mods.factorio.com/mod/pyalienlife/downloads - im not sure is still supported.

Probably you need to upgrade to newest versions of Py mods (all - not only this one).

Be aware that this was not the first slaughterhouse I have placed. All before went fine.

Do you upgraded your Factorio version recently? That may have caused it

As I play factorio via steam, the upgrade comes automatically. But if I remember correcly, I think there were some upgrade some weeks ago (not sure where I can look it up).
Anyways, thanks for the hint. I will try to upgrade and check if it still occurs.

OK I did upgrade the mods.
Looks like the error does not occur now. But as I feared a few recipies are different. So I have to rework a subset of my base.
Still I am happy that the game can continue :)

Yep, those old versions can be very unstable. Glad you got it fixed