i get this error
machine-upgrades/script/module-counter.lua:15: This module prototype has multiple effects! Someone else messed with this module: mupgrade-module-quality-negative.
Effects = {}.

Mods that are causing the crash: {"Silicon", "Unofficial_Space_Age_Changes"}

Please let that mod's creator know: "Please blacklist any modules with 'mupgrade' in the name to avoid the crash."

stack traceback:
[C]: in function 'assert'
machine-upgrades/script/module-counter.lua:15: in main chunk
[C]: in function 'require'
machine-upgrades/script/technology-linker.lua:3: in main chunk
[C]: in function 'require'
machine-upgrades/control.lua:6: in main chunk

I was able to recreate the issue on my end and the mod that was causing it is called Machine Upgrades

Luckily this is a quick fix and all that was need was to blacklist mupgrade from Machine Upgrades because they have there own negative quality effecting modules and with the recent changes I made to unofficial space age changes it effects any module that messes with quality crafting chance that is negative.

This will be fixed in 1.0.10 to have compatibility with this mod: https://mods.factorio.com/mod/machine-upgrades

I tested 1.0.10 Unofficial Space Age Changes with Machine Upgrades and im able to load in a world

Let me know if it is good on your end thank you.