Can't build for iOS with UE 5.5.4

[MKI_Archi]

I am having trouble building for iOS.

I am using:

Unreal Engine 5.5.4
Cesium for Unreal 2.16
macOS 15.5
Xcode 16.3

I create an empty project and add Cesium to it. macOS builds work fine but when I try to run it on my iPad, the following errors show up.

At first, I thought it was a general error but as soon as I remove Cesium from it, I can build again. Not to mention, I can also readily build the template projects to my iPad.

I will be also trying out earlier versions of Cesium to see if anything makes a difference. In the meantime, any kind of help is greatly appreciated.

[Kevin_Ring]

Hi @MKI_Archi, welcome to the community!

Please see here:

Building Cesium-Unreal for VisionOS

Hi @dagillespie, I don’t have any ready-made solutions for any of this, but I may be able to help you make some progress, at least. First, that Exited with code: 139 error. I also saw that on my corporate-managed MBP when packaging for iOS. I spent awhile trying to debug it, and I still don’t know exactly why it happens. UnrealBuildTool seems to simply be crashing for no clear reason. But I was able to work around it by disabling the Unreal Build Accelerator. Create ~/Library/Application Supp…

I think that either disabling UBA or setting the MaxParallelActions to 2 (or both) may help in your case as well. It’s worth a try, at least.

[MKI_Archi]

@Kevin_Ring

disabling UBA

Thank you so much for the response! Disabling UBA seemed to do the trick. Works great now.