Package Failed out of nowhere

Hello,

Somehow my packaging started failing yesterday. I didn’t change anything substantial in my project before it started.
I can’t seem to figure out what is causing it.

Does anyone have an idea?

This is the error part of my output log:

MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: KERNELBASE.dll!UnknownFunction (0x00007ff965ce606c) + 0 bytes [UnknownFile:0]
MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: 
MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: UE4Editor-Core.dll!UnknownFunction (0x00007ff92c7171b4) + 0 bytes [UnknownFile:0]
MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: 
MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: UE4Editor-Core.dll!UnknownFunction (0x00007ff92c5a99d9) + 0 bytes [UnknownFile:0]
MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: 
MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: UE4Editor-CoreUObject.dll!UnknownFunction (0x00007ff92c279274) + 0 bytes [UnknownFile:0]
MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: 
MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: UE4Editor-UnrealEd.dll!UnknownFunction (0x00007ff92805a9ca) + 0 bytes [UnknownFile:0]
MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: 
MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: UE4Editor-UnrealEd.dll!UnknownFunction (0x00007ff9285468d8) + 0 bytes [UnknownFile:0]
MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: 
MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: UE4Editor-UnrealEd.dll!UnknownFunction (0x00007ff9284f9434) + 0 bytes [UnknownFile:0]
MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: 
MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: UE4Editor-UnrealEd.dll!UnknownFunction (0x00007ff92852286b) + 0 bytes [UnknownFile:0]
MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: 
MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: UE4Editor-Cmd.exe!UnknownFunction (0x00007ff694c56b4e) + 0 bytes [UnknownFile:0]
MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: 
MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: UE4Editor-Cmd.exe!UnknownFunction (0x00007ff694c4f8ec) + 0 bytes [UnknownFile:0]
MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: 
MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: UE4Editor-Cmd.exe!UnknownFunction (0x00007ff694c4fa4a) + 0 bytes [UnknownFile:0]
MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: 
MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: UE4Editor-Cmd.exe!UnknownFunction (0x00007ff694c5bf19) + 0 bytes [UnknownFile:0]
MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: 
MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: UE4Editor-Cmd.exe!UnknownFunction (0x00007ff694c5c971) + 0 bytes [UnknownFile:0]
MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: 
MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: KERNEL32.DLL!UnknownFunction (0x00007ff9666f16ad) + 0 bytes [UnknownFile:0]
MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: 
MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: ntdll.dll!UnknownFunction (0x00007ff9685b4409) + 0 bytes [UnknownFile:0]
MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: 
MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: ntdll.dll!UnknownFunction (0x00007ff9685b4409) + 0 bytes [UnknownFile:0]
MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: 
MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: 
MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: 
MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: 
MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: [2014.10.23-08.18.07:826][  0]LogExit: Executing StaticShutdownAfterError
MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: [2014.10.23-08.18.07:841][  0]LogWindows: FPlatformMisc::RequestExit(1)
MainFrameActions: Packaging (Windows (64-bit)): CommandUtils.Run: Run: Took 45,52664s to run UE4Editor-Cmd.exe, ExitCode=3
MainFrameActions: Packaging (Windows (64-bit)): Project.Cook: Cook failed. Deleting cooked data.
MainFrameActions: Packaging (Windows (64-bit)): ErrorReporter.Error: ERROR: AutomationTool error: Cook failed.
MainFrameActions: Packaging (Windows (64-bit)): BuildCommand.Execute: ERROR: BUILD FAILED
MainFrameActions: Packaging (Windows (64-bit)): Program.Main: ERROR: AutomationTool terminated with exception:
MainFrameActions: Packaging (Windows (64-bit)): Program.Main: ERROR: Exception in AutomationScripts.Automation: BUILD FAILED: Failed while running Cook for C:\Users\Admin\Documents\Unreal Projects\LightDemoScene\LightDemoScene.uproject; see log C:\Users\Admin\AppData\Roaming\Unreal Engine\AutomationTool
MainFrameActions: Packaging (Windows (64-bit)): \Logs\C+Program+Files+Unreal+Engine+4.5\Cook.txt
MainFrameActions: Packaging (Windows (64-bit)): Stacktrace:    at Project.Cook(ProjectParams Params)
MainFrameActions: Packaging (Windows (64-bit)):    at BuildCookRun.DoBuildCookRun(ProjectParams Params)
MainFrameActions: Packaging (Windows (64-bit)):    at BuildCommand.Execute()
MainFrameActions: Packaging (Windows (64-bit)):    at AutomationTool.Automation.Execute(List`1 CommandsToExecute, CaselessDictionary`1 Commands)
MainFrameActions: Packaging (Windows (64-bit)):    at AutomationTool.Automation.Process(String[] CommandLine)
MainFrameActions: Packaging (Windows (64-bit)):    at AutomationTool.Program.MainProc(Object Param)
MainFrameActions: Packaging (Windows (64-bit)):    at AutomationTool.InternalUtils.RunSingleInstance(MainProc Main, Object Param)
MainFrameActions: Packaging (Windows (64-bit)):    at AutomationTool.Program.Main()
MainFrameActions: Packaging (Windows (64-bit)): Program.Main: ERROR: BUILD FAILED: Failed while running Cook for C:\Users\Admin\Documents\Unreal Projects\LightDemoScene\LightDemoScene.uproject; see log C:\Users\Admin\AppData\Roaming\Unreal Engine\AutomationTool\Logs\C+Program+Files+Unreal+Engine+4.5\Cook.txt
MainFrameActions: Packaging (Windows (64-bit)): ProcessManager.KillAll: Trying to kill 0 spawned processes.
MainFrameActions: Packaging (Windows (64-bit)): Program.Main: AutomationTool exiting with ExitCode=25
MainFrameActions: Packaging (Windows (64-bit)): Domain_ProcessExit
MainFrameActions: Packaging (Windows (64-bit)): ProcessManager.KillAll: Trying to kill 0 spawned processes.
MainFrameActions: Packaging (Windows (64-bit)): copying UAT log files...
MainFrameActions: Packaging (Windows (64-bit)): RunUAT.bat ERROR: AutomationTool was unable to run successfully.
MainFrameActions: Packaging (Windows (64-bit)): BUILD FAILED
LogWindows: LaunchURL http://answers.unrealengine.com

I have the same problem when building for windows.

Hi all,

Thank you for your report. We were not able to investigate this on the engine version you reported, but there have been many version changes to UE4 since this question was first posted. With a new version of the Engine comes new fixes and it is possible that this issue has changed or may no longer occur. Due to timetable of when this issue was first posted, we are marking this post as resolved for tracking purposes. If you are still experiencing the issue you reported in the current engine version, then please respond to this message with additional information and we will investigate as soon as possible. If you are experiencing a similar, but different issue at this time, could you please submit a new report for it.