Failed to load mods: ...ctorio_hd_age_space_age_base__/prototypes/mech-armor.lua:1: attempt to index field '?' (a nil value)
stack traceback:
...ctorio_hd_age_space_age_base__/prototypes/mech-armor.lua:1: in main chunk
[C]: in function 'require'
factorio_hd_age_space_age_base/data-final-fixes.lua:6: in main chunk

Hi, could you please send me your log file or post its contents here.
Please try also loading the base game with just the "Factorio HD Age: Space Age - Base" mod. Does the error still occur then?

I strongly suspect that you're using a mod that alters the Mech Armor in some way, and that's why, which is causing collisions.

you wouldn't happen to know where i can find the full log ?

Im using a bunch of mods, the largest one is Krastorio2 with K2 spaced Out as well

I thought i would have some fun trying to figure it out on my own, i removed the mech armor prototype and its reference in the data final and boom it loaded successfully.

Hi,
since you use a lot of mods, I definitely need the content of your log file to identify potential sources of conflict.

The current Factorio log file, factorio-current.log, is stored in your user data directory alongside your saves and mods.

File Names
Current log: factorio-current.log
Previous run log: factorio-previous.log

Operating System Paths

• Windows: Press Win + R, type %appdata%\Factorio and press Enter.

• macOS: Open Finder, press Cmd + Shift + G, and paste ~/Library/Application Support/factorio.

• Linux: Navigate to ~/.factorio/ in your home directory

Ah, so when I submitted my last post, your second message was just loaded.

Yes, deleting it will solve the problem for you right now. But you'll have to do that again every time I update my mod. That's why it's generally important for me to figure out which mods are causing conflicts so I can address them in the program code and fix compatibility issues for everyone.
That's why I'd appreciate it if you could still send me the contents of your log file.

https://pastebin.com/3k7nzxvd

Hi, thanks for the log file.
So far, I haven't been able to reproduce the error.
Since you've already found a workaround for yourself, I'm going to put the troubleshooting on hold for now after three evenings of trying to find the problem, until I have more time or perhaps further clues from others in the discussions here.