Ive never seen this, and have not the slightest clue on how to fix it. I hope I didn't break my map so close to release!  If you can help me I would be so grateful!

Did you accidentally hit "Convert" in the launcher before? Because that's what would usually cause something unfixable LOL

Try this:

Use script placer and create a new mod. Then copy everything over from NUMACHI to the NEW MOD and by the way, Shorten the name. It almost hits max.

Then RECOMPILE and do the usual.

Now this COULD fix it or you will have to look more into this throughout GOOGLE.

If you can go back to Radiant and open your map, press Ctrl+Shift+K to let Radiant point you some errors and in the log down your 2D view there will be the explanation of that error. Some of them will be probably about lightgrid which seeing your screenshot this is the point where the compile process crashed. If this is the case, Radiant will switch your view to the lightgrid's to work with, when you have finished press Shift+L until you return to the normal view or continue with the next error.

the converter doesnt "break" anything, it just deletes any files you dont have in a GDT

So any precompiled resources people sent you, would be deleted if you accidentally run the "convert all assets" instead of "convert current asset only" in error

What did you do lately? Add any terrain patches? Maybe too many verticees in them?