Simply start the game, and it instantly crashes.
crash-2020-06-17_22.40.06-client.txt

Forge version 31.2.20, MC 1.15.2.

Mods being used.

This issue has been marked as stale because it has been inactive for 3 weeks. It will be closed if it remains inactive for another 3 weeks.

This issue has been closed since it has been inactive for 3 weeks since it was marked as stale.

Same crash reason different mod that caused it for me, it was Survive Combat Compat causing the copper ore crash.

I'm not using that so Idek.

I need some help here.

Somebody also reported yesterday, that BetterPVP was causing this same error for them. Seems like a error from mod compatibility, so try removing one mod at a time. (And post back, so the devs know what to fix!)

I'm not using that either so.

Try removing the mod Traverse, it might be causing the crash.

Removing Placebo (along with FastFurnace and FastWorkbench, which it's core for) stopped the crash for me.

I removed Quark Oddities as part of working on something else, and the crash started occurring again. Adding Oddities back fixes it.

Interestingly enough, I got this crash because of another mod that needed an updated version of Java. Without Create, it would post a message saying to upgrade my Java version, but with Create enabled, it would crash with this exact exception...very strange indeed.

So could this be related to another mod crashing or another mod needing an updated version of Java? I have no idea. The only consistency seems to be another mod causing the issue, not necessarily Create itself.

I just removed Performant and the error stopped happening. Performant wasn't loading correctly without Create on either. I'm not sure if Lithium causes the same issue since they're basically the same mod. I also updated my NVIDIA drivers and Java.

This mod REALLY needs actual testing tbh...

The test team is the dev team 😏

2020-08-04-4.log
Here

Seems that in your particular instance, Corail Tombstone failed to load with the turkish OS locale.
As was discovered by other users, this crash seems to happen more likely when another mod interrupts the pipeline somehow.

If it's not that, it could also be caused by configs being loaded too early.
Create crashes this way when it tries to register config-driven worldgen without knowing about its own blocks.
I suppose best would be to collect more logs.

i know about corail but the log was the same after i removed it with create

for me, removing fast furnace and workbench alongside with placebo fixed it

Can someone who has been affected by this crash provide the corresponding log file? Alongside the crash-reports folder exists a log folder in which we might find the true reason to the failed launch. Cheers!