If I let Quark Generate a New Config, modpack starts up with no issue besides the normal console crap. Not sure exactly which setting but been trying to limit it down. If I make changes to Quark modpack fails to load. I can delete the config and reload.

Quark-r1.5-138
Forge 2768

Crash Report: https://pastebin.com/32EAjADM
Config Changes: https://pastebin.com/X3Z5TAdf

This appears to be an issue with Ore Stone Variants. @PersonTheCat

Thanks. This is definitely an error message that I wrote. @O13SC3N3 The problem is that my config file assumes that you're using both Quark's marble and limestone simultaneously. I can change OSV to do a manual test to avoid that for stone types with built-in support, but the way it's supposed to work is that you remove whichever stone type you aren't using from the config file under "block groups." So, if you're disabling limestone, just remove the line that reads "quark:limestone." And then, like I said, I'll just add a workaround in this case so that it won't be necessary in the future.

Ah okay, Thank You!