Packing Failed (Windows 64-Bit)

when i try to export my projekt to Windows 64-bit this error show up:

UATHelper: Packaging (Windows (64-bit)): UE4Editor-Cmd: Execution of commandlet took: 13.68 seconds
UATHelper: Packaging (Windows (64-bit)): UE4Editor-Cmd: [2017.04.11-14.28.53:163][ 0]LogOnline:Display: Unloading online subsystem: NULL
UATHelper: Packaging (Windows (64-bit)): CommandUtils.Run: Run: Took 39,3800113s to run UE4Editor-Cmd.exe, ExitCode=0
UATHelper: Packaging (Windows (64-bit)): Project.Cook: ********** COOK COMMAND COMPLETED **********
UATHelper: Packaging (Windows (64-bit)): Project.CopyBuildToStagingDirectory: ********** STAGE COMMAND STARTED **********
UATHelper: Packaging (Windows (64-bit)): Project.CreateStagingManifest: Creating Staging Manifest…
UATHelper: Packaging (Windows (64-bit)): Project.CleanStagingDirectory: Cleaning Stage Directory: C:\Users\Documents\Unreal Projects\LiveRPG\Saved\StagedBuilds\WindowsNoEditor
UATHelper: Packaging (Windows (64-bit)): Project.CreatePakUsingStagingManifest: Creating pak using staging manifest.
UATHelper: Packaging (Windows (64-bit)): Program.Main: ERROR: AutomationTool terminated with exception: AutomationTool.AutomationException: Staging manifest already contains C:\Users\Documents\Unreal Projects\LiveRPG\Saved\Cooked\WindowsNoEditor\LiveRPG\Content\FirstPersonBP\Material\Straße.uasset (or a file that differs in case only)
UATHelper: Packaging (Windows (64-bit)): bei Project.CreatePakResponseFileFromStagingManifest(DeploymentContext SC)
UATHelper: Packaging (Windows (64-bit)): bei Project.CreatePakUsingStagingManifest(ProjectParams Params, DeploymentContext SC)
UATHelper: Packaging (Windows (64-bit)): bei Project.ApplyStagingManifest(ProjectParams Params, DeploymentContext SC)
UATHelper: Packaging (Windows (64-bit)): bei Project.CopyBuildToStagingDirectory(ProjectParams Params)
UATHelper: Packaging (Windows (64-bit)): bei BuildCookRun.DoBuildCookRun(ProjectParams Params)
UATHelper: Packaging (Windows (64-bit)): bei BuildCookRun.ExecuteBuild()
UATHelper: Packaging (Windows (64-bit)): bei AutomationTool.BuildCommand.Execute()
UATHelper: Packaging (Windows (64-bit)): bei AutomationTool.Automation.Execute(List1 CommandsToExecute, CaselessDictionary1 Commands)
UATHelper: Packaging (Windows (64-bit)): bei AutomationTool.Automation.Process(String[] Arguments)
UATHelper: Packaging (Windows (64-bit)): bei AutomationTool.Program.MainProc(Object Param)
UATHelper: Packaging (Windows (64-bit)): bei AutomationTool.InternalUtils.RunSingleInstance(Func`2 Main, Object Param)
UATHelper: Packaging (Windows (64-bit)): bei AutomationTool.Program.Main()
UATHelper: Packaging (Windows (64-bit)): Program.Main: AutomationTool exiting with ExitCode=1 (Error_Unknown)
UATHelper: Packaging (Windows (64-bit)): BUILD FAILED
PackagingResults:Error: Error Unknown Error

Thanks

Hey -

I noticed you posted the same question here: Packing Error (+ Console Error) - Platform & Builds - Epic Developer Community Forums

I will be closing this post to focus attention for this issue in a single location.

Cheers