Getting this when I try to switch weapons on the engineer spidertron.

Error while running event SpidertronWeaponSwitcher::switch-spidertron-weapons (ID 184)
SpidertronWeaponSwitcher/control.lua:66: attempt to index local 'spidertron' (a nil value)
stack traceback:
SpidertronWeaponSwitcher/control.lua:66: in function 'replace_spidertron'
SpidertronWeaponSwitcher/control.lua:182: in function <SpidertronWeaponSwitcher/control.lua:169>

Thanks for the report. I just released weapon switcher 1.1 and I tried the 2 together and they seemed to work fine. You (deliberately) can't switch the weapons on the spidertron engineer, but it worked on the other placed spidertrons in the world. There could be an issue from adding weapon switcher mod to an existing spidertron engineer save because I haven't checked that yet.

Correction: I definitely did fix this bug in WeaponSwitcher 1.1.0.

Ah I only had version 1.0.0 When did that get released?

errr... 20 minutes ago :P

(I had already fixed it before you reported it)