Hello,
This only seems to effect the game after today, I believe there was an update for the launcher and it seems others have this problem also.
I use a modded version of Minecraft (Forge 1.12.2)
I understand that not much help can be done with unofficial versions however this is definitely to do with the new update of the launcher somehow as everything was working yesterday and I have not changed anything. I tested on another unofficial version and it crashes also (Optifine 1.12.2).
I have attached the latest log and also the launcher log. Hopefully you can find the problem.
Thank You!
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I have just started getting this problem today, can load normal game version but it wont load optifine or my client! whats happened?

I have the exact same issue, but the log doesn't give out anything. As soon as I hit play on Optifine or Forge it instantly crashes.

xD i dont know what Mojang is doing out there

haha, everyone is having this problem! i hope it will be resolved very soon, though it is only doing it when people try to load optifine or forge, atleast we arent alone with this problem 😃

looks like they have fixed it by giving out another update just click the icon and it will update again and it will let you use optifine
Thank you for your report!
However, this issue is a Duplicate of MCL-8361.
If you have additional information, please add it to that report.
Please search before reporting, as it's likely that one exists already.
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