Error while packaging project for android

UATHelper: Packaging (Android (All)): UEDeployAndroid.MakeApk:
UATHelper: Packaging (Android (All)): ====7/26/2017 10:33:13 PM====PREPARING TO MAKE APK=================================================================
UATHelper: Packaging (Android (All)): Program.Main: ERROR: AutomationTool terminated with exception: System.ComponentModel.Win32Exception (0x80004005): The system cannot find the file specified
UATHelper: Packaging (Android (All)): at System.Diagnostics.Process.StartWithCreateProcess(ProcessStartInfo startInfo)
UATHelper: Packaging (Android (All)): at System.Diagnostics.Process.Start(ProcessStartInfo startInfo)
UATHelper: Packaging (Android (All)): at UnrealBuildTool.UEDeployAndroid.GetLatestSDKApiLevel(AndroidToolChain ToolChain)
UATHelper: Packaging (Android (All)): at UnrealBuildTool.UEDeployAndroid.GetSdkApiLevel(AndroidToolChain ToolChain)
UATHelper: Packaging (Android (All)): at UnrealBuildTool.UEDeployAndroid.MakeApk(AndroidToolChain ToolChain, String ProjectName, String ProjectDirectory, String OutputPath, String EngineDirectory, Boolean bForDistribution, String CookFlavor, Boolean bMakeSeparateApks, Boolean bIncrementalPackage, Boolean bDisallowPackagingDataInApk, Boolean bDisallowExter
nalFilesDir)
UATHelper: Packaging (Android (All)): at UnrealBuildTool.UEDeployAndroid.PrepForUATPackageOrDeploy(FileReference ProjectFile, String ProjectName, String ProjectDirectory, String ExecutablePath, String EngineDirectory, Boolean bForDistribution, String CookFlavor, Boolean bIsDataDeploy)
UATHelper: Packaging (Android (All)): at AndroidPlatform.Package(ProjectParams Params, DeploymentContext SC, Int32 WorkingCL)
UATHelper: Packaging (Android (All)): at Project.Package(ProjectParams Params, Int32 WorkingCL)
UATHelper: Packaging (Android (All)): at BuildCookRun.DoBuildCookRun(ProjectParams Params)
UATHelper: Packaging (Android (All)): at BuildCookRun.ExecuteBuild()
UATHelper: Packaging (Android (All)): at AutomationTool.BuildCommand.Execute()
UATHelper: Packaging (Android (All)): at AutomationTool.Automation.Execute(List1 CommandsToExecute, CaselessDictionary1 Commands)
UATHelper: Packaging (Android (All)): at AutomationTool.Automation.Process(String] Arguments)
UATHelper: Packaging (Android (All)): at AutomationTool.Program.MainProc(Object Param)
UATHelper: Packaging (Android (All)): at AutomationTool.InternalUtils.RunSingleInstance(Func`2 Main, Object Param)
UATHelper: Packaging (Android (All)): at AutomationTool.Program.Main()
UATHelper: Packaging (Android (All)): Program.Main: AutomationTool exiting with ExitCode=1 (Error_Unknown)
UATHelper: Packaging (Android (All)): BUILD FAILED
PackagingResults:Error: Error Unknown Error

i fixed that but there is new error