Android Packaging is not working

Hello
I tried to build my Project using the Engine in Version 4.8.1. I already searched for this Issue, and people say that u need to create a Keystore file or update the Android SDK - i tried both and none did fixed this issue - then i tried using the Enviroment Variable _JAVA_OPTIONS setting it’s Memory to 512Mb and setted it up to 2Gb but it also doesn’t helped. Then i thought it may be a problem with Java version 8, so i installed JRE 7. but this also did not help. I have no more Ideas what i could try to solve this problem.

May someone here knows how to fix it.

down below i have a couple of lines from my output log - you can see much more on UE4 Build Log - Pastebin.com

Output Log

   K\JavaLibs\downloader_library\bin\classes.jar
-> classes-a49c087ad0ddab592ede1b635801eac0.jar
    **LogPlayLevel:        [dx] Could not create the Java virtual machine.
    LogPlayLevel:        [dx] Error occurred during initialization of VM
    LogPlayLevel:        [dx] Could not reserve enough space for object heap**
    LogPlayLevel: BUILD FAILED
    LogPlayLevel: C:\NVPACK\android-sdk-windows\tools\ant\build.xml:888: The following error occurred while executing this line:
    LogPlayLevel: C:\NVPACK\android-sdk-windows\tools\ant\build.xml:890: The following error occurred while executing this line:
    LogPlayLevel: C:\NVPACK\android-sdk-windows\tools\ant\build.xml:902: The following error occurred while executing this line:
    LogPlayLevel: C:\NVPACK\android-sdk-windows\tools\ant\build.xml:283: null returned: 1
    LogPlayLevel: Total time: 15 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:/NVPACK/apache-ant-1.8.2/bin/ant.bat" debug
    [...]
    LogPlayLevel: BUILD FAILED
    PackagingResults:Error: Error Launch failed! Unknown Error

I Solved this issue by reinstalling the JDK (Now using Version 8 Upadate 20) - also i reinstalled the whole NVPACK as said above. Then i set all the Enviroment variables (or checked them) and i also setted all the paths in the Project Settings in point “Android SDK”. This worked fine for me.

If my answer doesn’t help go here: Android project name causes ant.bat error - Platform & Builds - Unreal Engine Forums