Resource packs

Iris Failed to Create Shader Rendering Pipeline (ParseCancellationException)

What it looks like in the log

org.antlr.v4.runtime.misc.ParseCancellationException: program "gbuffers_basic.fsh" line <so>:0 no viable alternative at input 'sldakfnge\nvec3'`

How to fix it

  1. Open Options > Video Settings > Shader Packs (or press O in-game) and switch to a different shader pack to confirm the issue is caused by that specific pack.
  2. Update both Iris (or Oculus on Forge) and the affected shader pack to the latest versions made for your Minecraft release.
  3. Reset the shader pack's configuration by deleting its matching .txt settings file inside your .minecraft/shaderpacks folder, in case a specific combination of toggled shader options generated broken GLSL code.
  4. If you are developing or editing the shader pack yourself, open the shader file and inspect the line number shown in the ParseCancellationException (and any files #include-d into that program) to fix the syntax error near the quoted input text.
LoadersFabric, Quilt, Neoforge, Forge
SeverityBreaks something
CategoryResource packs

Check your own log

Related errors

Resource packsCompletionException: RuntimeException: could not reload shadersOpen logs/latest.log and scroll below 'could not reload shaders' to find the 'Caused by:' line (typically ShadResource packsIris Error: GLSL Source Pre-Processing FailedOpen Options > Video Settings > Shader Packs in Minecraft and switch to a known Iris-compatible shaderpack (suResource packsIris RenderTargets ArrayIndexOutOfBoundsException When Loading Shader PackUpdate Iris (and Sodium) to the latest version available for your Minecraft release, as newer Iris builds propResource packsIris Shaders Crash When Importing Shader Pack Settings (BaseOptionElementWidget NullPointerException)Relaunch Minecraft—this crash is a temporary menu race condition and does not permanently corrupt your game coResource packsIris Shaders Fails to Compile entities_alpha (Undefined iris_vertexColor)Update Iris Shaders (along with your matching Sodium version) to the newest release available for your MinecraResource packsIris Warning: Unknown variable BIOME_* When Resolving Custom UniformsIf your game is still running, you can safely ignore this warning; if your game actually crashed, scroll to th