For the 1.1 version of K2 there is an option to disable the Larger K2 containers incase someone has AAI Containers & Warehouses. This causes a error on startup due to missing medium containers.

Trying to reproduce locally.
edit1:
Reproduced:
- https://cdn.discordapp.com/attachments/785820785871945738/846337089855684618/unknown.png
- https://cdn.discordapp.com/attachments/785820785871945738/846337195317133322/unknown.png
- indeed the issue is because the ghost weaver uses {"kr-medium-container", 10}, and if that options is disabled it does not exists anymore, i'll need to verify the option or just use normal containers
- going to talk with Resar which fix to take.

edit2:
- easier than expected to use the krastorio2 setting itself.
- if that setting is disabled, instead of k2-medium-container just going to revert back to {"steel-chest",10},
- trying to push a new build right now

edit3:
- added version 0.3.9 that should have the fix for this. Thanks for the info and tell me if there is any other problems.

To add on that can you make it if one has AAI Containers & Warehouses it uses the it's 2x2 chests instead. Strongbox I think is the name will check when I can startup Factorio.

Do-able, though you might wait a while for this since i got a lot of stuff (cough i'm lazy) to do this period.