Good afternoon! I seem to be encountering a crash after using the 'q' menu to modify the quark configuration. The exact settings used do not appear to matter, as I've confirmed that changing any option then quitting and starting Minecraft again will cause the issue to occur. The exact error generated in the log is slightly different each time depending on the choice of configuration changed.

Initially there were 23 mods in use when this happened, but I've confirmed that pairing it down to just Quark and AutoRegLib, the issue still remains. The error log generated when running only quark and autoreglib, after turning off four options, is located at Pastebin per request in the guidelines here: Paste.
EDIT: Pastebin for some reason tagged it for moderation? Uploaded to Ubuntu's Pastebin service, and confirmed working, here.

Hopefully I haven't committed any of the basic cardinal sins? If I have, apologies, and I understand you hard closing this with extreme prejudice!

The paste is private.

The paste is private.

Oddly, all of the settings are set to public. Apparently there are issues with the post being tagged for moderation? I have no idea why. I'm editing the original link and including a new one here to Ubuntu's Pastebin, which I've tested in Private View to make sure it works. The log I'm including was regenerated just now. My hand changed settings worked correctly, it seems to just be saving a change via the 'q' menu causing the issue.

Pasted Error log

I noticed you made a commit a within a few minutes of letting me know that the pastebin post wasn't viewable. Just tested, and can confirm that Quark-r2.4-306 fixes the issue. Whatever was happening must have been another presentation of the issues others were experiencing. I'll close this issue; thank you as always for an amazing mod!