Unknown error building Android ETC1

Build fails pretty early on, not sure what’s really causing it, help please!

UATHelper: Packaging (Android (ETC1)): Running AutomationTool...
UATHelper: Packaging (Android (ETC1)): Automation.ParseCommandLine: Parsing command line: -ScriptsForProject="C:/Users/leown/Documents/Unreal Projects/ButterflyEffect/ButterflyEffect.uproject" BuildCookRun -nocompile -nocompileeditor -installed -nop4 -project="C:/Users/leown/Documents/Unreal Projects/ButterflyEffect/ButterflyEffect.uproject" -cook -stage -ar
chive -archivedirectory="C:/Users/leown/Documents/Unreal Projects/ButterflyEffect/Exports" -package -clientconfig=Development -ue4exe=UE4Editor-Cmd.exe -pak -prereqs -nodebuginfo -targetplatform=Android -cookflavor=ETC1 -build -CrashReporter -utf8output
UATHelper: Packaging (Android (ETC1)): Automation.Process: Setting up command environment.
UATHelper: Packaging (Android (ETC1)): BuildCookRun.SetupParams: Setting up ProjectParams for C:\Users\leown\Documents\Unreal Projects\ButterflyEffect\ButterflyEffect.uproject
UATHelper: Packaging (Android (ETC1)): Project.Build: ********** BUILD COMMAND STARTED **********
UATHelper: Packaging (Android (ETC1)): CommandUtils.Run: Run: C:\Program Files\Epic Games\UE_4.14\Engine\Binaries\DotNET\UnrealBuildTool.exe ButterflyEffect Android Development -Project="C:\Users\leown\Documents\Unreal Projects\ButterflyEffect\ButterflyEffect.uproject"  "C:\Users\leown\Documents\Unreal Projects\ButterflyEffect\ButterflyEffect.uproject"  -rem
oteini="C:\Users\leown\Documents\Unreal Projects\ButterflyEffect" -noxge -generatemanifest -NoHotReload
UATHelper: Packaging (Android (ETC1)): UnrealBuildTool: NDK version: 23, GccVersion: 4.9
UATHelper: Packaging (Android (ETC1)): UnrealBuildTool: ERROR: Attempted to use UEBuildBinaryConfiguration.OutputFilePath property, but there are multiple (or no) OutputFilePaths. You need to handle multiple in the code that called this (size = 2)
UATHelper: Packaging (Android (ETC1)): CommandUtils.Run: Run: Took 1.4284519s to run UnrealBuildTool.exe, ExitCode=5
UATHelper: Packaging (Android (ETC1)): Program.Main: ERROR: AutomationTool terminated with exception: AutomationTool.CommandUtils+CommandFailedException: Command failed (Result:5): C:\Program Files\Epic Games\UE_4.14\Engine\Binaries\DotNET\UnrealBuildTool.exe ButterflyEffect Android Development -Project="C:\Users\leown\Documents\Unreal Projects\ButterflyEffe
ct\ButterflyEffect.uproject"  "C:\Users\leown\Documents\Unreal Projects\ButterflyEffect\ButterflyEffect.uproject"  -remoteini="C:\Users\leown\Documents\Unreal Projects\ButterflyEffect" -noxge -generatemanifest -NoHotReload. See logfile for details: 'UnrealBuildTool-2017.05.22-21.10.18.txt' 
UATHelper: Packaging (Android (ETC1)):    at AutomationTool.CommandUtils.RunAndLog(String App, String CommandLine, String Logfile, Int32 MaxSuccessCode, String Input, ERunOptions Options, Dictionary`2 EnvVars, SpewFilterCallbackType SpewFilterCallback)
UATHelper: Packaging (Android (ETC1)):    at AutomationTool.CommandUtils.RunAndLog(CommandEnvironment Env, String App, String CommandLine, String LogName, Int32 MaxSuccessCode, String Input, ERunOptions Options, Dictionary`2 EnvVars, SpewFilterCallbackType SpewFilterCallback)
UATHelper: Packaging (Android (ETC1)):    at AutomationTool.CommandUtils.RunUBT(CommandEnvironment Env, String UBTExecutable, String CommandLine, String LogName, Dictionary`2 EnvVars)
UATHelper: Packaging (Android (ETC1)):    at AutomationTool.CommandUtils.RunUBT(CommandEnvironment Env, String UBTExecutable, FileReference Project, String Target, String Platform, String Config, String AdditionalArgs, String LogName, Dictionary`2 EnvVars)
UATHelper: Packaging (Android (ETC1)):    at AutomationTool.UE4Build.BuildWithUBT(String TargetName, UnrealTargetPlatform TargetPlatform, String Config, FileReference UprojectPath, Boolean ForceMonolithic, Boolean ForceNonUnity, Boolean ForceDebugInfo, Boolean ForceFlushMac, Boolean DisableXGE, String InAddArgs, Boolean ForceUnity, Dictionary`2 EnvVars)
UATHelper: Packaging (Android (ETC1)):    at AutomationTool.UE4Build.Build(BuildAgenda Agenda, Nullable`1 InDeleteBuildProducts, Boolean InUpdateVersionFiles, Boolean InForceNoXGE, Boolean InUseParallelExecutor, Boolean InForceNonUnity, Boolean InForceUnity, Boolean InShowProgress, Dictionary`2 PlatformEnvVars, Nullable`1 InChangelistNumberOverride, Dictiona
ry`2 InTargetToManifest)
UATHelper: Packaging (Android (ETC1)):    at Project.Build(BuildCommand Command, ProjectParams Params, Int32 WorkingCL, ProjectBuildTargets TargetMask)
UATHelper: Packaging (Android (ETC1)):    at BuildCookRun.DoBuildCookRun(ProjectParams Params)
UATHelper: Packaging (Android (ETC1)):    at BuildCookRun.ExecuteBuild()
UATHelper: Packaging (Android (ETC1)):    at AutomationTool.BuildCommand.Execute()
UATHelper: Packaging (Android (ETC1)):    at AutomationTool.Automation.Execute(List`1 CommandsToExecute, CaselessDictionary`1 Commands)
UATHelper: Packaging (Android (ETC1)):    at AutomationTool.Automation.Process(String[] Arguments)
UATHelper: Packaging (Android (ETC1)):    at AutomationTool.Program.MainProc(Object Param)
UATHelper: Packaging (Android (ETC1)):    at AutomationTool.InternalUtils.RunSingleInstance(Func`2 Main, Object Param)
UATHelper: Packaging (Android (ETC1)):    at AutomationTool.Program.Main()
UATHelper: Packaging (Android (ETC1)): Program.Main: AutomationTool exiting with ExitCode=5 (5)
UATHelper: Packaging (Android (ETC1)): BUILD FAILED
PackagingResults:Error: Error Unknown Error

Try this thread. Looks like you may be set up to build more than one android package at a time. You either need to provide the output paths for each or only enable one android package.

Yeah, see if both arm7 and arm64 are enabled. Try disabling arm64.

Ahh, yeah arm64 was enabled, turning it off fixed it, thanks for your help!