Modpack version
1.81a

Issue
modpack crash on start up of world

Logs
crash-2020-10-10_11.52.01-client.txt

You appear to be using outdated Java. This is often caused by Twitch defaulting to an older version than you have available. Follow these steps to update.

• Make sure you have the latest 64-bit Java installed
  https://www.java.com/en/download/manual.jsp Windows Offline (64-bit) is the one you need
• Go to the Twitch Minecraft settings
• Add -version:1.8+ to the Additional Arguments

If this does not solve the issue, please make use of our Discord's support channel :)

We use the issue tracker exclusively for bug reports, development and feature requests. However, this issue appears to be a support request. Please use the support channel on our Discord to get help.