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Third party Mono related error when remote building for iOS

After upgrading to UE4.21, when trying to launch on iOS device I got following errors.

 LogPlayLevel:   [Remote] Executing build
 LogPlayLevel:     Setting up Mono
 LogPlayLevel:     Building TLM...
 LogPlayLevel:     2019-01-09 05:35:44.571 defaults[1264:13408]
 LogPlayLevel:     The domain/default pair of (com.apple.dt.Xcode, IDEBuildOperationMaxNumberOfConcurrentCompileTasks) does not exist
 LogPlayLevel:     Running command : Engine/Binaries/DotNET/UnrealBuildTool.exe TLM IOS Development -deploy -SkipRulesCompile -XmlConfigCache=/Users/harvey/UE4/Builds/HARVEY/C/Work/UnrealEngine4/Engine/Intermediate/Build/XmlConfigCache.bin -Log=/Users/harvey/UE4/Builds/HARVEY/C/Work/UnrealEngine4/Engine/Programs/AutomationTool/Saved/Logs/UBT-TLM-IOS-Development_Remote.txt -Manifest=/Users/harvey/UE4/Builds/HARVEY/C/Work/UnrealEngine4/TLM/Intermediate/Remote/TLM/IOS/Development/Manifest.xml -Project=/Users/harvey/UE4/Builds/HARVEY/C/Work/UnrealEngine4/TLM/TLM.uproject -Project=/Users/harvey/UE4/Builds/HARVEY/C/Work/UnrealEngine4/TLM/TLM.uproject -NoUBTMakefiles -remoteini=/Users/harvey/UE4/Builds/HARVEY/C/Work/UnrealEngine4/TLM -skipdeploy -ini:Game:[/Script/UnrealEd.ProjectPackagingSettings]:BlueprintNativizationMethod=Disabled -NoHotReload -ignorejunk -CreateStub -NoUBTMakefiles -ImportProvision=/Users/harvey/UE4/Builds/HARVEY/C/Work/UnrealEngine4/TLM/Intermediate/Remote/TLM/IOS/Development/TLMDevelopment.mobileprovision -ImportCertificate=/Users/harvey/UE4/Builds/HARVEY/C/Work/UnrealEngine4/TLM/Intermediate/Remote/TLM/IOS/Development/Certificate.p12 -ImportCertificatePassword=A
 LogPlayLevel: Warning:     WARNING: -SkipDeploy conflicts with -Deploy - ignoring
 LogPlayLevel:     Building UnrealHeaderTool...
 LogPlayLevel:     While compiling /Users/harvey/UE4/Builds/HARVEY/C/Work/UnrealEngine4/Engine/Intermediate/Build/BuildRules/UE4Rules.dll:
 LogPlayLevel:     (0,0) : error : Cannot open assembly '/Users/harvey/UE4/Builds/HARVEY/C/Work/UnrealEngine4/Engine/Build/BatchFiles/Mac/../../../Binaries/ThirdParty/Mono/Mac/lib/mono/4.5/mcs.exe': No such file or directory.
 LogPlayLevel: Error:     ERROR: Unable to compile source files.
 LogPlayLevel:            (see C:\Work\UnrealEngine4\Engine\Programs\AutomationTool\Saved\Logs\UBT-TLM-IOS-Development_Remote_UHT.txt for full exception trace)
 LogPlayLevel: Error:     Error: UnrealHeaderTool failed for target 'TLM' (platform: IOS, module info: /Users/harvey/UE4/Builds/HARVEY/C/Work/UnrealEngine4/TLM/Intermediate/Build/IOS/TLM/Development/TLM.uhtmanifest, exit code: OtherCompilationError (5)).
 LogPlayLevel:   [Remote] Downloading C:\Work\UnrealEngine4\Engine\Programs\AutomationTool\Saved\Logs\UBT-TLM-IOS-Development_Remote.txt
 LogPlayLevel: Took 565.2822311s to run UnrealBuildTool.exe, ExitCode=7
 LogPlayLevel: Error: ERROR: UnrealBuildTool failed. See log for more details. (C:\Work\UnrealEngine4\Engine\Programs\AutomationTool\Saved\Logs\UBT-TLM-IOS-Development.txt)
 LogPlayLevel:        (see C:\Work\UnrealEngine4\Engine\Programs\AutomationTool\Saved\Logs\Log.txt for full exception trace)
 LogPlayLevel: AutomationTool exiting with ExitCode=7 (7)
 LogPlayLevel: Completed Launch On Stage: Build Task, Time: 568.950702
 PackagingResults: Error: Deployment failed! Unknown Error

Besides UE, I've also upgraded my remote MacOS to Mojave and XCode to 10.1. It's seems that there is missing some files related to Mono third party, but there is it supposed to be?

Product Version: UE 4.21
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asked Jan 09 '19 at 01:52 PM in Packaging & Deployment

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Downloaded Mono from here:


And installed on remote MacOS. Passed through the point of error.

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answered Jan 09 '19 at 02:54 PM

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