Error launch android

Hi,

when i try to launch my project on adroid it fails that is really weird it worked before and i changed nothing
it fails whe n i copy → paste a project.

LogPlayLevel: BUILD FAILED
LogPlayLevel: C:\MyNVPACK\android-sdk-windows\tools\ant\build.xml:716: The following error occurred while executing this line:
LogPlayLevel: C:\MyNVPACK\android-sdk-windows\tools\ant\build.xml:730: Compile failed; see the compiler error output for details.
LogPlayLevel: Total time: 9 seconds
LogPlayLevel: BuildCommand.Execute: ERROR: BUILD FAILED
LogPlayLevel: Program.Main: ERROR: AutomationTool terminated with exception:
LogPlayLevel: Program.Main: ERROR: Exception in UnrealBuildTool: ERROR: cmd.exe failed with args /c “C:/MyNVPACK/apache-ant-1.8.2/bin/ant.bat” debug
LogPlayLevel: Stacktrace: bij UnrealBuildTool.Android.UEDeployAndroid.RunCommandLineProgramAndThrowOnError(String WorkingDirectory, String Command, String Params, String OverrideDesc, Boolean bUseShellExecute)
LogPlayLevel: bij UnrealBuildTool.Android.UEDeployAndroid.MakeApk(String ProjectName, String ProjectDirectory, String OutputPath, String EngineDirectory, Boolean bForDistribution, String CookFlavor, Boolean bMakeSeparateApks, Boolean bIncrementalPackage, Boolean bDisallowPackagingDataInApk)
LogPlayLevel: bij UnrealBuildTool.Android.UEDeployAndroid.PrepForUATPackageOrDeploy(String ProjectName, String ProjectDirectory, String ExecutablePath, String EngineDirectory, Boolean bForDistribution, String CookFlavor, Boolean bIsDataDeploy)
LogPlayLevel: bij AndroidPlatform.Deploy(ProjectParams Params, DeploymentContext SC)
LogPlayLevel: bij Project.Deploy(ProjectParams Params)
LogPlayLevel: bij BuildCookRun.DoBuildCookRun(ProjectParams Params)
LogPlayLevel: bij BuildCommand.Execute()
LogPlayLevel: bij AutomationTool.Automation.Execute(List1 CommandsToExecute, CaselessDictionary1 Commands)
LogPlayLevel: bij AutomationTool.Automation.Process(String[] CommandLine)
LogPlayLevel: bij AutomationTool.Program.MainProc(Object Param)
LogPlayLevel: bij AutomationTool.InternalUtils.RunSingleInstance(MainProc Main, Object Param)
LogPlayLevel: bij AutomationTool.Program.Main()
LogPlayLevel: Program.Main: ERROR: ERROR: cmd.exe failed with args /c “C:/MyNVPACK/apache-ant-1.8.2/bin/ant.bat” debug

Duplicate of this question which is already answered: ERROR: Exception in UnrealBuildTool: ERROR: cmd.exe failed with args - Programming & Scripting - Epic Developer Community Forums