Describe the bug
The game client crashes when ticking an entity, specifically an item frame. This is caused by a java.lang.NoSuchMethodError, indicating that the LambDynamicLights mod is calling a method related to item frames that does not exist in the current version of Minecraft.

To Reproduce
Steps to reproduce the behavior:

Launch Minecraft with the specified mod versions.

Load into a world (singleplayer or multiplayer).

Approach an area containing an item frame entity.

The game crashes as the entity is ticked.

Expected behavior
The game should continue to run without crashing when item frames are loaded and ticked. If an item frame contains a light-emitting block or item, it should correctly produce dynamic light as intended by the mod.

Screenshots
Not applicable. A full crash report was generated and is provided in the additional context.

Desktop (please complete the following information):

OS: Windows 11

Minecraft: 1.21.10

Fabric Loader version: 0.17.2

Mods:

fabric-api-0.135.0+1.21.10

lambdynamiclights-4.7.2+1.21.9

sodium-fabric-0.7.0+mc1.21.9

Version: 4.7.2

Branch: mc1.21.9

Additional context

The key line from the crash report is:
java.lang.NoSuchMethodError: 'net.minecraft.class_1799 net.minecraft.class_1533.method_6940()'

And the stack trace begins at:
at knot//dev.lambdaurora.lambdynlights.api.entity.luminance.ItemFrameLuminance.getLuminance(ItemFrameLuminance.java:39)

I cannot reproduce the issue.

Please give the full crash report.

Thank you for the quick response. Here is the full crash report you asked for. The crash happens consistently when an item frame is loaded in the world.

crash-2025-10-08_23.01.28-client.txt

I've attempted to reproduce again, this time with an identical mod list, to no avail.

This leads me to believe your instance might be corrupted, as this method should exist.

Thanks for taking your time to check it. I'll check my instance.

Hi again,

I did the test with a minimal mod setup. I disabled all of my other mods and resource packs, leaving only Fabric API and LambDynamicLights (v4.8.2+1.21.10) active.

The game still crashes with the exact same NoSuchMethodError as soon as an item frame is loaded. This confirms the issue is a bug within LambDynamicLights itself and not a mod conflict.

Here is the crash report from that test.

crash-2025-10-09_19.08.16-client.txt

I hope this helps you track down the bug! Thank you.

@TheRainbowDerp06 Did you manage to fix it? I'm having the same issue with you but with v4.8.6+ 1.21.10

@moshi-onGithub yes. my instance was corrupted. I had to install a new instance and then add all the mods again and it worked.

I see, thank you!