[Bug] a class is missing in newer versions and fabric 1.20.1 just does not launch like the vanilla.

[jhu7600codes]

Describe the bug

so, it just crashes with error code -1.

The log file and images/videos

latestlog.txt

Steps To Reproduce

start amethyst launcher
install 1.20.1 fabric
try to play

Expected Behavior

it’s gonna crash soon after the play button is hit.

Platform

- Device model: iPhone 13
- iOS version: 26.0.1
- Amethyst version: Latest Release from GitHub Actions

Anything else?

I can’t play anything higher 1.12.2 for some reason

[RespectiveScriptures]

According to the core error report, the crash is caused by corrupted or incompatible Fabric library files. Based on your log, I identify three issues:

1. Insufficient allocated RAM: Your iPhone 13 has a total of 4GB RAM, but you only allocated 512MB to the game. The vanilla Minecraft 1.10.1 already requires at least 1GB of RAM to run, not to mention the Fabric mod loader (1.6GB to 2GB is recommended).

2. Incorrect Java version: The official recommended Java version for Minecraft 1.20.1 is Java 17 (you are using Java 21), so it's advised to switch to the correct one.

3. Incomplete game client or Fabric files: However, given the RAM issue, the error may also result from an out of memory error that caused the specified files to fail loading, making the program unable to locate the target files.

Summary: Adjust the RAM allocation and switch to the correct Java version—both settings are available in the settings interface. Alternatively, delete the game version and reinstall it (only use this method if the first two solutions don't work).

[jhu7600codes]

okay, thank you.