Crash When Enabling Shaders: NoSuchFieldError: TESSELATION_SHADERS (Iris Flywheel Compat)

What the log looks like

java\.lang\.NoSuchFieldError: TESSELATION_SHADERS
net\.irisshaders\.iris\.shaderpack\.programs\.ProgramSet\.handler\$[a-z0-9]+\$irisflw\$initGBufferFlw

How to fix it

1. Open your Minecraft instance's `mods` folder and locate the Iris Flywheel Compat `.jar` file (usually starting with `iris-flywheel-compat`).
2. Update Iris Flywheel Compat to the latest version available on Modrinth or CurseForge that explicitly supports Iris 1.7 or newer for your Minecraft version.
3. Delete the old `iris-flywheel-compat` `.jar` file so you do not have duplicate versions in your `mods` folder.
4. If no updated version of Iris Flywheel Compat is available—or if you do not have Create / Flywheel installed—remove `iris-flywheel-compat` from your `mods` folder completely.

Check your own log