Error when doing remote iOS build (4.21 preview)

Development Platform & Builds XR Development
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1

Hello, when I tried to remote build an iOS AR app which could be successfully built with 4.20, the following error occured.

I also found some other guys encountered the same issue who had post more details in this reddit post:

--------------------------------------------- ERROR MESSAGE FROM HERE --------------------------------

UATHelper: Packaging (iOS): ERROR: UnrealBuildTool Exception: Unable to load XML config cache (/Users/xxxx/UE4/Builds/xxxx/C/Users/xxxx/AppData/Local/UnrealEngine/XmlConfigCache-D+Epic_Games+UE_4.21.bin)
PackagingResults: Error: UnrealBuildTool Exception: Unable to load XML config cache (/Users/xxxx/UE4/Builds/xxxx/C/Users/xxxx/AppData/Local/UnrealEngine/XmlConfigCache-D+Epic_Games+UE_4.21.bin)
UATHelper: Packaging (iOS): [Remote] Downloading C:\Users\xxxx\AppData\Roaming\Unreal Engine\AutomationTool\Logs\D+Epic+Games+UE_4.21\UBT-ARTest-IOS-Development_Remote.txt
UATHelper: Packaging (iOS): ERROR: File for download ‘C:\Users\xxxx\AppData\Roaming\Unreal Engine\AutomationTool\Logs\D+Epic+Games+UE_4.21\UBT-ARTest-IOS-Development_Remote.txt’ is not under any mapped directory.
UATHelper: Packaging (iOS): (see C:\Users\xxxx\AppData\Roaming\Unreal Engine\AutomationTool\Logs\D+Epic+Games+UE_4.21\UBT-ARTest-IOS-Development.txt for full exception trace)
PackagingResults: Error: File for download ‘C:\Users\xxxx\AppData\Roaming\Unreal Engine\AutomationTool\Logs\D+Epic+Games+UE_4.21\UBT-ARTest-IOS-Development_Remote.txt’ is not under any mapped directory.
UATHelper: Packaging (iOS): Took 39.9946919s to run UnrealBuildTool.exe, ExitCode=5
UATHelper: Packaging (iOS): ERROR: UnrealBuildTool failed. See log for more details. (C:\Users\xxxx\AppData\Roaming\Unreal Engine\AutomationTool\Logs\D+Epic+Games+UE_4.21\UBT-ARTest-IOS-Development.txt)
UATHelper: Packaging (iOS): (see C:\Users\xxxx\AppData\Roaming\Unreal Engine\AutomationTool\Logs\D+Epic+Games+UE_4.21\Log.txt for full exception trace)
PackagingResults: Error: UnrealBuildTool failed. See log for more details. (C:\Users\xxxx\AppData\Roaming\Unreal Engine\AutomationTool\Logs\D+Epic+Games+UE_4.21\UBT-ARTest-IOS-Development.txt)
UATHelper: Packaging (iOS): AutomationTool exiting with ExitCode=5 (5)
UATHelper: Packaging (iOS): BUILD FAILED
PackagingResults: Error: Unknown Error

2

I get the same error. 4.20 remote works and building directly on mac with 4.21 also works. Didn’t find a solution…

3

same here in Preview4 - I also submitted a bug report