Crash on UE 5.5 Startup: Assertion failed: FallbackMaterialProxy/ Carla build error in windows11

[cptbtptpyu]

I am experiencing a persistent crash while trying to launch Unreal Editor (v5.5) after a fresh source build. Error: Assertion failed: FallbackMaterialProxy in MaterialRenderProxy.cpp [Line: 730].

could please anyone tell me how to fix it? thanks a lot

[wjbaschab]

Also was unable to launch the editor due to this error. If there is a fix please let me know!

[eh2002xp]

I found parts of the issue with this. This is most likely caused by 62575ff. I reverted the commit and afterwards UE5 launched just fine.

Edit: I did some more digging on this. It seems like the error occurs in line 161 of SegmentationSensorRendering.cpp when evaluating 'LandscapeMaterialInstanceConstant'

Edit2: If you don't want to revert said commit you can also remove the code in lines 161-163 and the error will go away. Disclaimer: I've not tested that for unexpected behavior

[MesaMitch]

Hello @wjbaschab were you able to resolve this? @eh2002xp could you specify the commit id of the carla ue5-dev branch and Content branch so its smoother, couldnt find the piece of code mentioned by you