Android - Packaging fails because of too large integer?

Hi.

As in the title I´m trying to build a very small project for android (one extremely low poly mesh). When I launch it on my device it works, but when I try to package a shipping version, the process crashes with the error

inFrameActions: Packaging (Android (All)): -compile:
MainFrameActions: Packaging (Android (All)): [javac] Compiling 68 source files to F:\UnrealProjects\ProjectName\Intermediate\Android\APK\bin\classes
MainFrameActions: Packaging (Android (All)): [javac] F:\UnrealProjects\ProjectName\Intermediate\Android\APK\src\com\CompanyName\Alias\OBBData.java:20: error: integer number too large: 2789046397
MainFrameActions: Packaging (Android (All)): [javac] 2789046397 // the length of the file in bytes
MainFrameActions: Packaging (Android (All)): [javac] ^
MainFrameActions: Packaging (Android (All)): [javac] 1 error
MainFrameActions: Packaging (Android (All)): BUILD FAILED
MainFrameActions: Packaging (Android (All)): C:\NVPACK\android-sdk-windows\tools\ant\build.xml:716: The following error occurred while executing this line:
MainFrameActions: Packaging (Android (All)): C:\NVPACK\android-sdk-windows\tools\ant\build.xml:730: Compile failed; see the compiler error output for details.
MainFrameActions: Packaging (Android (All)): Total time: 7 seconds
MainFrameActions: Packaging (Android (All)): BuildCommand.Execute: ERROR: BUILD FAILED
MainFrameActions: Packaging (Android (All)): Program.Main: ERROR: AutomationTool terminated with exception:
MainFrameActions: Packaging (Android (All)): Program.Main: ERROR: Exception in UnrealBuildTool: ERROR: cmd.exe failed with args /c “C:\NVPACK\apache-ant-1.8.2/bin/ant.bat” debug
MainFrameActions: Packaging (Android (All)): Stacktrace: bei UnrealBuildTool.Android.UEDeployAndroid.RunCommandLineProgramAndThrowOnError(String WorkingDirectory, S
MainFrameActions: Packaging (Android (All)): tring Command, String Params, String OverrideDesc, Boolean bUseShellExecute)
MainFrameActions: Packaging (Android (All)): bei UnrealBuildTool.Android.UEDeployAndroid.MakeApk(String ProjectName, String ProjectDirectory, String OutputPath, String EngineDirectory, Boolean bForDistribution, String CookFlavor, Boolean bMakeSeparateApks, Boolean bIncrementalPackage, Boolean bDisallowPackagingDataInApk)
MainFrameActions: Packaging (Android (All)): bei UnrealBuildTool.Android.UEDeployAndroid.PrepForUATPackageOrDeploy(String ProjectName, String ProjectDirectory, String ExecutablePath, String EngineDirectory, Boolean bForDistribution, String CookFlavor, Boolean bIsDataDeploy)
MainFrameActions: Packaging (Android (All)): bei AndroidPlatform.Package(ProjectParams Params, DeploymentContext SC, Int32 WorkingCL)
MainFrameActions: Packaging (Android (All)): bei Project.Package(ProjectParams Params, Int32 WorkingCL)
MainFrameActions: Packaging (Android (All)): bei BuildCookRun.DoBuildCookRun(ProjectParams Params)
MainFrameActions: Packaging (Android (All)): bei BuildCommand.Execute()
MainFrameActions: Packaging (Android (All)): bei AutomationTool.Automation.Execute(List1 CommandsToExecute, CaselessDictionary1 Commands)
MainFrameActions: Packaging (Android (All)): bei AutomationTool.Automation.Process(String[] CommandLine)
MainFrameActions: Packaging (Android (All)): bei AutomationTool.Program.MainProc(Object Param)
MainFrameActions: Packaging (Android (All)): bei AutomationTool.InternalUtils.RunSingleInstance(MainProc Main, Object Param)
MainFrameActions: Packaging (Android (All)): bei AutomationTool.Program.Main()
MainFrameActions: Packaging (Android (All)): Program.Main: ERROR: ERROR: cmd.exe failed with args /c “C:\NVPACK\apache-ant-1.8.2/bin/ant.bat” debug
MainFrameActions: Packaging (Android (All)): ProcessManager.KillAll: Trying to kill 0 spawned processes.
MainFrameActions: Packaging (Android (All)): Program.Main: AutomationTool exiting with ExitCode=1
MainFrameActions: Packaging (Android (All)): Domain_ProcessExit
MainFrameActions: Packaging (Android (All)): ProcessManager.KillAll: Trying to kill 0 spawned processes.
MainFrameActions: Packaging (Android (All)): copying UAT log files…
MainFrameActions: Packaging (Android (All)): RunUAT.bat ERROR: AutomationTool was unable to run successfully.
MainFrameActions: Packaging (Android (All)): BUILD FAILED

How is it even possible? I´m not even using big integers in my project. The highest number is 5.
I tried to provide a keystore but same thing. I also tried different versions of the tegra sdk (or whatever it is clled) and am currently on the latest AndroidWorks.

EDIT: After trying to build a shipping version also the launch on device fails until I delete everything within the Build\Android directory.

EDIT2: I tried to do the exact same stuff with Unity, same assets, same functionality, same SDK versions. Works perfectly from scratch.

Any idea?