Iris Crash: Iris.getPipelineManager() is null During Game Initialization

What the log looks like

java\.lang\.NullPointerException: Cannot invoke "net\.coderbot\.iris\.pipeline\.PipelineManager\.getPipeline\(\)" because the return value of "net\.coderbot\.iris\.Iris\.getPipelineManager\(\)" is null

How to fix it

1. Remove the Not Enough Crashes (or Crash Assistant/similar crash-handler) mod from your mods folder so Minecraft stops immediately at the real startup error.
2. Check if you are running Minecraft 1.17 with an older version of Iris (such as 1.1.x) alongside standalone Sodium; older 1.17 Iris builds already bundle Sodium, so remove the separate Sodium jar or update both Iris and Sodium to their latest matching versions for your Minecraft version.
3. Launch the game again without Not Enough Crashes and open logs/latest.log to see the actual mod entrypoint or dependency error that interrupted startup.
4. If you recently added or updated mods before this started, remove the newly added mods in batches until the game launches cleanly.

Check your own log