Resource packs

Iris RenderTargets ArrayIndexOutOfBoundsException When Loading Shader Pack

What it looks like in the log

java.lang.ArrayIndexOutOfBoundsException: null @ [net.coderbot]

How to fix it

  1. Update Iris (and Sodium) to the latest version available for your Minecraft release, as newer Iris builds properly handle or ignore invalid DRAWBUFFERS characters.
  2. Check your latest.log for the 'Using shaderpack:' line right before the error to identify which shader pack triggered the failure, then update that shader pack or switch to an Iris-compatible alternative.
  3. If you cannot switch shaders right away, open optionsshaders.txt in your .minecraft folder and delete the shaderPack= value (or move the broken .zip out of your shaderpacks folder) so the game loads cleanly.
  4. If you are editing or maintaining the shader pack yourself, search its .fsh files for /* DRAWBUFFERS:... */ comments containing non-numeric letters like 'N' and replace them with valid buffer indices or RENDERTARGETS directives.
LoadersFabric, Quilt, Forge
SeverityBreaks something
CategoryResource packs

Check your own logDownload iris on 9Minecraft

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