If I only check FOUNDRY and this library,this lib will stop from starting the game because cant find electromagnetic-plant somehow,
if you check all these 3 factory (cryogenic,electromagnetic,foundry)with the lib,game will proceed with no error occured.

my fault I think

I added "if mods["um-standalone-electromagnetic-plant"] for the EM parts but accidently left

table.insert(data.raw["assembling-machine"]["electromagnetic-plant"].crafting_categories, "crafting-or-electromagnetics")

inside if mods["space-exploration"]
so if you have SE and not EM plant standalone it will cause problems :(
um... just need to move that

ok ，after update，this bug disappeared. Case closed. Thank you for the quick fix.