Unreal Engine 5.4.1 with Cesium for Unreal 2.5.0 fails to package iOS

Cesium for Unreal
1

Hello.
Cesium for Unreal 2.5.0 was released on Marketplace and I installed it on Unreal Engine 5.4.1 and tried to package it for iOS.
Then I got the following error and packaging failed.

UATHelper: Packaging (IOS): ------ Building 4 action(s) started ------
UATHelper: Packaging (IOS): [1/4] sh /Users/macneko/UnrealProjects/CFUSample2 5.4/Binaries/IOS/CFUSample2
UATHelper: Packaging (IOS): ld: library not found for -l/Users/Shared/Epic Games/UE_5.4/Engine/Plugins/Marketplace/CesiumForUnreal/Source/CesiumRuntime/../ThirdParty/lib/iOS-xarm64/libktx.a
UATHelper: Packaging (IOS): clang: error: linker command failed with exit code 1 (use -v to see invocation)
UATHelper: Packaging (IOS): Total time in Parallel executor: 1.84 seconds
PackagingResults: Error: linker command failed with exit code 1 (use -v to see invocation)
UATHelper: Packaging (IOS): Total execution time: 7.11 seconds
UATHelper: Packaging (IOS): Took 7.22s to run dotnet, ExitCode=6
UATHelper: Packaging (IOS): UnrealBuildTool failed. See log for more details. (/Users/username/Library/Logs/Unreal Engine/LocalBuildLogs/UBA-CFUSample2-IOS-Development.txt)
UATHelper: Packaging (IOS): AutomationTool executed for 0h 0m 9s
UATHelper: Packaging (IOS): AutomationTool exiting with ExitCode=6 (6)
UATHelper: Packaging (IOS): RunUAT ERROR: AutomationTool was unable to run successfully. Exited with code: 6
PackagingResults: Error: AutomationTool was unable to run successfully. Exited with code: 6
PackagingResults: Error: Unknown Error

I assume it is a plugin issue as it also occurs in the Cesium for Unreal sample project.
Can you please tell us how to solve this problem?

1 Like
2

Hi @macneko,

This appears to be a bug in our 2.5.0 release. I wrote an issue here:

Weā€™ll get this fixed as soon as we can.

In the meantime, hereā€™s a workaround you can try. Iā€™m not certain this will work, but itā€™s worth a try. In your Unreal Engine directory in Engine/Plugins/Marketplace/CesiumForUnreal/Source/ThirdParty/lib/iOS-xarm64/ktx.framework/, thereā€™s a file named simply ktx. Copy that file to the parent directory (Engine/Plugins/Marketplace/CesiumForUnreal/Source/ThirdParty/lib/iOS-xarm64/) and rename it to libktx.a. Then try again and see if youā€™re able to package.

Otherwise, the only other workaround is to use the previous release (v2.4.1). However, that also means youā€™ll need to go back to UE 5.3. If you want to use the previous release, instructions are here:

3

Hi @Kevin_Ring

Thanks for the reply.
I will wait for the bug fix and try the workaround as well.

4

Let me know if the workaround works for you. Iā€™m very curious, and canā€™t easily try it myself.

5

Hi @Kevin_Ring

I tried the workaround you gave me.
We succeeded in packaging it as you predicted!
I will proceed this way for now until the plugin modifications are completed.
Thanks!

6

Good to hear! We fixed the problem properly in this PR:

So that will be included in the next release at the beginning of June. Thanks for reporting it.