The only mods being used are "ChemistryForYou", "BrimStuff" and "Tantalite" (since without tantalite, chemforyou does not open for CRT and productivity science reasons)
https://imgur.com/a/CdsfJv4

also, brimstuff does not seem to have a technology called "organic chemistry", so when both are installed together (and now with other bz / timeken / other material mods) we get this new error: https://imgur.com/a/wmoMGtt

if mods["BrimStuff"] then
data:extend(
{
{
type = "technology",
name = "saltpeter-sulfuric-acid",
icons = (mods["Krastorio2"] and
{
{ icon = "base/graphics/icons/fluid/sulfuric-acid.png", icon_size = 64},
{ icon = "BrimStuff/graphics/icons/potassium-nitrate.png", icon_size = 64, scale=0.5, shift= {-8, -8}},
} or {
{ icon = "base/graphics/icons/fluid/sulfuric-acid.png", icon_size = 64},
}),
prerequisites = {"organic-chemistry"},
effects = {
{
type = "unlock-recipe",
recipe = "saltpeter-sulfuric-acid",
}
},
unit =
{
count = 150,
ingredients =
{
{ "automation-science-pack", 1 },
{ "logistic-science-pack", 1 },
{ "chemical-science-pack", 1 },
{ "productivity-science-pack", 1 }
},
time = 30
}
},

by the way, is the "productivity science pack" an only krastorio2 thing? i couldn't find any use for this science pack.

Should be fixed next update.
The productivity science pack is something I am still working on, its used when there are a lot of mods atm.