Could not initialize class net.irisshaders.iris.pathways.FullScreenQuadRenderer
Crash to desktop when loading into a world with Iris Shaders already turned on.
Minecraft 1.21.1 - Neoforge 21.1.180
I tried doing binary search on my mods to find the culprit but so far its a select few mods that crash the game and with every change I do with a mod the frequency of these crashes are inconsistent.
List of mods that might cause crashes when ran together:
-Just Enough Resoruces
-Lootr
-Regions Unexplored - Terrablender is fine
-Map Atlases - Moonlight lib is fine
-Mccaw Furniture
-Lithostitched
-LootJS with ProbJS together?
-SuperMartijn642's Core Lib
-Natures Compass
That's the end of the list before I realized it got random and stopped doing it altogether; the latest log has the mod list that was enabled prior to crashing. Anytime I tuned off these mods the game wouldn't consistently crash when loading into a world.
The latest log is provided
Solution:Jump to solution
Nice so it is ProbeJS! Neat™!
Thank you lots, It just seemed so random when I kept turning off and on mods but I guess in hindsight I prob should've noticed it....
9 Replies
crash-2025-06-17_16.55.01-client.txt
uploaded to mclo.gsUploaded by sammy2188
Will look into this soon enough. I have a program right now.
Thanks for the acknowledgement!
I've managed to strip the pack the pack back down to the few mods that might cause issues:
The options.txt should be set up so that you can simply start a world, with shaders already on, and it should just crash. Just made someone test it on their computer.
I also noticed that a mod contains Forgified Fabric API that's listed in the crash report; would that cause any known issues? Just throwing that out there.
I hope my 6 GB RAM laptop doesn't crash...
:yes:
My laptop is struggling real hard, but I managed to get it running.
ProbeJS is the one triggering the crash for this specific instance.
Disabling only ProbeJS allows me to enter a world.
Glorious 2-3 fps on this ancient laptop.

Nice so I guess when im done making my modpack i can just disable that and it should be good to release?
I should prob try it out before I say anything :P
Definitely give it a try first.
Solution
Nice so it is ProbeJS! Neat™!
Thank you lots, It just seemed so random when I kept turning off and on mods but I guess in hindsight I prob should've noticed it.