Android packaging failed

Hello, when I try to package my projet for Android (Shipping) I got an error and I do not know how to fix it. Here is the error log:

UATHelper: Packaging (Android (Multi:ASTC,PVRTC,DXT,ATC,ETC2,ETC1)): BUILD FAILED
UATHelper: Packaging (Android (Multi:ASTC,PVRTC,DXT,ATC,ETC2,ETC1)): C:\NVPACK\android-sdk-windows\tools\ant\build.xml:871: Can't read [C:\NVPACK\android-sdk-windows\platforms\android-24\android.jar] (Can't process class [dalvik/system/DexClassLoader.class] (Unsupported class version number [52.0] (maximum 51.0, Java 1.7)))
UATHelper: Packaging (Android (Multi:ASTC,PVRTC,DXT,ATC,ETC2,ETC1)): Total time: 14 seconds
UATHelper: Packaging (Android (Multi:ASTC,PVRTC,DXT,ATC,ETC2,ETC1)): Program.Main: ERROR: AutomationTool terminated with exception: System.IO.FileNotFoundException: Le fichier 'B:\Unreal Projects\RollTheBall\Intermediate/Android/APK/bin/RollTheBall-release.apk' est introuvable.
UATHelper: Packaging (Android (Multi:ASTC,PVRTC,DXT,ATC,ETC2,ETC1)): Nom de fichier : 'B:\Unreal Projects\RollTheBall\Intermediate/Android/APK/bin/RollTheBall-release.apk'
UATHelper: Packaging (Android (Multi:ASTC,PVRTC,DXT,ATC,ETC2,ETC1)):    à System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
UATHelper: Packaging (Android (Multi:ASTC,PVRTC,DXT,ATC,ETC2,ETC1)):    à System.IO.File.InternalCopy(String sourceFileName, String destFileName, Boolean overwrite, Boolean checkHost)
UATHelper: Packaging (Android (Multi:ASTC,PVRTC,DXT,ATC,ETC2,ETC1)):    à UnrealBuildTool.UEDeployAndroid.MakeApk(AndroidToolChain ToolChain, String ProjectName, String ProjectDirectory, String OutputPath, String EngineDirectory, Boolean bForDistribution, String CookFlavor, Boolean bMakeSeparateApks, Boolean bIncrementalPackage, Boolean bDisallowPackagingDat
aInApk, Boolean bDisallowExternalFilesDir)
UATHelper: Packaging (Android (Multi:ASTC,PVRTC,DXT,ATC,ETC2,ETC1)):    à UnrealBuildTool.UEDeployAndroid.PrepForUATPackageOrDeploy(FileReference ProjectFile, String ProjectName, String ProjectDirectory, String ExecutablePath, String EngineDirectory, Boolean bForDistribution, String CookFlavor, Boolean bIsDataDeploy)
UATHelper: Packaging (Android (Multi:ASTC,PVRTC,DXT,ATC,ETC2,ETC1)):    à AndroidPlatform.Package(ProjectParams Params, DeploymentContext SC, Int32 WorkingCL)
UATHelper: Packaging (Android (Multi:ASTC,PVRTC,DXT,ATC,ETC2,ETC1)):    à Project.Package(ProjectParams Params, Int32 WorkingCL)
UATHelper: Packaging (Android (Multi:ASTC,PVRTC,DXT,ATC,ETC2,ETC1)):    à BuildCookRun.DoBuildCookRun(ProjectParams Params)
UATHelper: Packaging (Android (Multi:ASTC,PVRTC,DXT,ATC,ETC2,ETC1)):    à BuildCookRun.ExecuteBuild()
UATHelper: Packaging (Android (Multi:ASTC,PVRTC,DXT,ATC,ETC2,ETC1)):    à AutomationTool.BuildCommand.Execute()
UATHelper: Packaging (Android (Multi:ASTC,PVRTC,DXT,ATC,ETC2,ETC1)):    à AutomationTool.Automation.Execute(List`1 CommandsToExecute, CaselessDictionary`1 Commands)
UATHelper: Packaging (Android (Multi:ASTC,PVRTC,DXT,ATC,ETC2,ETC1)):    à AutomationTool.Automation.Process(String[] Arguments)
UATHelper: Packaging (Android (Multi:ASTC,PVRTC,DXT,ATC,ETC2,ETC1)):    à AutomationTool.Program.MainProc(Object Param)
UATHelper: Packaging (Android (Multi:ASTC,PVRTC,DXT,ATC,ETC2,ETC1)):    à AutomationTool.InternalUtils.RunSingleInstance(Func`2 Main, Object Param)
UATHelper: Packaging (Android (Multi:ASTC,PVRTC,DXT,ATC,ETC2,ETC1)):    à AutomationTool.Program.Main()
UATHelper: Packaging (Android (Multi:ASTC,PVRTC,DXT,ATC,ETC2,ETC1)): Program.Main: AutomationTool exiting with ExitCode=1 (Error_Unknown)
UATHelper: Packaging (Android (Multi:ASTC,PVRTC,DXT,ATC,ETC2,ETC1)): BUILD FAILED
PackagingResults:Error: Error Unknown Error

The error is porbably coming from ANT because of this line:

UATHelper: Packaging (Android (Multi:ASTC,PVRTC,DXT,ATC,ETC2,ETC1)): C:\NVPACK\android-sdk-windows\tools\ant\build.xml:871: Can't read [C:\NVPACK\android-sdk-windows\platforms\android-24\android.jar] (Can't process class [dalvik/system/DexClassLoader.class] (Unsupported class version number [52.0] (maximum 51.0, Java 1.7)))

Cheers.

The issue was fixed by downgrading from JDK 8 to JDK 7 and changing CodeWorks suite from R5 to R4.