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I wanted to update the mod myself but i run into a problem where it gives the following error:
Error while loading item prototype "heavy-canon-shell"(ammo):Key"icon_size" not found in property tree at ROOT.ammo.heayvy-canon-shell

can someone help me with that?

p.s. i already removed the flag goes to main inventory and changed the science names

Add the key icon_size to each item protoype in data*.lua as the error message states.

Usually it's:

Thanks