Hello! I was perusing the settings for Bluetonium Fusion when I encountered the following startup error as a result of enabling the "Promethium fuel cell" setting:

Failed to load mods: Error in assignID: item with name 'promethium-scrap' does not exist.

Source: promethium-fusion-power-cell (recipe).

I will reach out to the author of scraptk to let them know as well.

Additionally, somewhat but not quite related, I also noticed that the localization string is missing for "mod-setting-name.nfb-old-radioactive-waste".

Please post the full list of mods that you are using.

Can do, just a moment - though I have confirmed this error occurs with only BluetoniumFusion and Scrappy Industry present. If I disable SI, but keep scraptk, the game loads.

Please post the full list of mods that you are using.

Here you go:

{
Bluetonium = "2.7.0",
BluetoniumFusion = "1.0.7",
Diversitree = "1.1.0",
EditMapSettings = "0.1.6",
EditorExtensions = "2.5.2",
FactorySearch = "1.14.0",
["Flare Stack"] = "4.0.3",
["Gleba-Science-Needs-Nutrients"] = "1.0.4",
HeavyExpensivePlaceables = "0.1.3",
NAS_Fork = "0.2.1",
NAS_Fork_Tweaks = "0.2.0",
["Planetary-Distance-Adjustments"] = "1.3.1",
QualityUnlocksRecycling = "0.1.4",
SchallEndgameEvolution = "2.0.1",
TaskList = "0.5.0",
["TheEckelmonster-core-library"] = "0.1.2",
["aai-programmable-structures"] = "0.8.2",
["aai-signals"] = "0.7.1",
["aai-zones"] = "0.7.2",
["all-seeing-satellite"] = "0.7.1",
["alloy-smelting"] = "0.5.0",
["aquilo-seabloom-algaculture"] = "0.4.2",
astroponics = "1.7.4",
base = "2.0.72",
["behemoth-enemies"] = "0.0.8",
biouranium = "1.0.0",
["boompuff-agriculture"] = "1.1.0",
bzlead = "2.0.28",
bzsilicon = "2.0.18",
bztin = "2.1.15",
bztitanium = "2.0.26",
bzzirconium = "2.1.13",
["cf-lib"] = "1.0.0",
["configurable-asteroids"] = "0.1.0",
["configurable-nukes"] = "0.8.6",
["crushing-industry"] = "0.4.21",
["cupric-asteroids"] = "1.5.5",
["data-utils"] = "0.10.1",
["demolisher-revenge"] = "0.12.1",
["diurnal-dynamics"] = "0.15.0",
["early-agriculture"] = "1.0.3",
eggs = "0.12.0",
["elevated-rails"] = "2.0.72",
fdsl = "0.2.4",
["fire-lights"] = "0.14.0",
flib = "0.16.5",
["fulgora-coralmium-agriculture"] = "1.2.5",
["fusion-thruster"] = "1.0.0",
["hot-metals"] = "1.2.10",
jetpack = "0.4.14",
leave_the_lights_on = "2.0.7",
["more-enemies"] = "0.7.2",
["more-space"] = "1.0.1",
multispoil = "2.1.2",
["nixie-tubes"] = "2.0.9",
["ore-scaling"] = "0.11.0",
["playtime-plus"] = "1.0.6",
pushbutton = "2.0.5",
quality = "2.0.72",
["science-bottles"] = "0.2.1",
["science-pack-glow-reborn"] = "1.0.4",
["scrap-chemistry"] = "0.5.0",
["scrap-industry"] = "1.1.0",
scraptk = "1.0.0",
["se-space-trains"] = "1.0.11",
["se-space-trains-patch"] = "1.0.3",
["self-destructing-portable-reactors"] = "0.1.0",
slipstacks = "1.1.0",
["space-age"] = "2.0.72",
textplates = "0.7.2",
["valerian-planets"] = "1.0.2",
["visible-planets"] = "1.5.7",
["vp-scale"] = "1.2.0",
["vulcanus-sulfuric-bacteria"] = "1.1.2",
["wood-industry"] = "2.1.3"
}

Fixed in Bluetonium 2.7.1.