Forge in only craftable by forge. How do I escape this loop? It is probably a bug and it must me craftable by machines the same way as foundries or Em plants.

Fixed in 0.1.5. It should also be craftable by an assembly or by hand.

Loaded the save in 0.1.5
Now it crashes after 10 seconds. Which is sad, because previously I could not make forge and not I cannot play at all.

The mod Castra (0.1.5) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event castra::on_tick (ID 0)
castra/control.lua:425: attempt to index global 'base_upgs' (a nil value)
stack traceback:
castra/control.lua:425: in function 'get_available_upgrades'
castra/control.lua:442: in function 'randomly_upgrade_base'
castra/control.lua:478: in function <castra/control.lua:474>

Let's try this again...0.1.6 fixes that error. Not sure what kind of typo I did to cause that haha.
I'm about to continue a save with the mod too, so worst case it would have been fixed then.

It works now. Thanks