New Crash on startup

Hello,
I've been getting a crash on startup. Looking through it, I see references to a fatal error regarding JSON, but I didn't add any new mods or make any changes from when I started it up last. While I was getting intermittent crashing, it wasn't on startup and it wasn't this consistent.
Is there a way to parse through this, or is the custom mod crashing fix probably going to be the way to go?
Update: I fixed it. Turns out the holdthekey.txt file in mods/saves was corrupted. I'm posting it here in case it helps anyone.
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