After updating the game to version 0.18.43, it gave me an error at startup:
24.176 Mods to disable:Failed to load mods: File not found: base/graphics/technology/effectivity-module.png

Mods to be disabled:
• boblibrary (0.18.10)
• CircuitProcessing (0.3.4)
• bobmodules (0.18.5)
• angelsbioprocessing (0.7.13)

I think the problem is in bobmodules.lua at line 60:
data.raw.technology[s.."-module"..i].icon = "base/graphics/technology/"..s.."-module.png"

If I change that to:
data.raw.technology[s.."-module"..i].icon = "base/graphics/technology/"..s.."-module-1.png"

Then it works again.

I have the same problem, i did not try the fix above. but after talking with the lovely people of bob/angels mods discord if you change the above in Circuit Processing mod. it will probably fix that yeah.

So to clarify, the problem is not actually in the mod bobmodules. but in the bobmodules.lua file in this mod.