Can't Package Game, Unknown Cook Failure

Having trouble packaging my game due to an unknown cook failure. Last part of log listed below. Any suggestions?

UPDATE: I found the trouble asset, “Monster_Jumper2” but cannot delete it. Anytime I select it in the editor, the editor crashes. No idea how to get rid of this.

MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: [2016.04.18-10.43.49:367][  0]LogWindows:Error: Windows GetLastError: The operation completed successfully. (0)
MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: [2016.04.18-10.43.50:183][  0]LogOutputDevice:Error: 
MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: begin: stack for UAT
MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: [2016.04.18-10.43.50:183][  0]LogWindows:Error: === Critical error: ===
MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: 
MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: Assertion failed: !HasAnyFlags(RF_NeedLoad|RF_NeedPostLoad) [File:D:\BuildFarm\buildmachine_++depot+UE4-Releases+4.10\Engine\Source\Runtime\CoreUObject\Private\UObject\UObjectLinker.cpp] [Line: 102] 
MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: Detaching from existing linker for ../../../../../../Users/brandon/Desktop/0415/Eventide_Package/Content/Mixamo/Monsters/BP_Monster_Jumper2.uasset while object BoolProperty /Game/Mixamo/Monsters/BP_Monster_Jumper2.BP_Monster_Jumper2_C:isAttacking needs loaded
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: 
MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: 
MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: 
MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: [2016.04.18-10.43.50:184][  0]LogOutputDevice:Error: 
MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: end: stack for UAT
MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: [2016.04.18-10.43.50:198][  0]LogPhysics:Warning: PHYSX: ..\..\PhysX\src\NpScene.cpp (2946) 8 : PxScene::unlockWrite() called without matching call to PxScene::lockWrite(), behaviour will be undefined.
LogParticles: Destroying 0 GPU particle simulations for FXSystem 0x0000013ABF0EF1A0
LogParticles: Destroying 0 GPU particle simulations for FXSystem 0x0000013BB38825C0
LogParticles: Destroying 0 GPU particle simulations for FXSystem 0x0000013C63054D60
LogParticles: Destroying 0 GPU particle simulations for FXSystem 0x0000013CB5852980
LogParticles: Destroying 0 GPU particle simulations for FXSystem 0x0000013C59B0E7A0
LogParticles: Destroying 0 GPU particle simulations for FXSystem 0x0000013D0601DBC0
LogParticles: Destroying 0 GPU particle simulations for FXSystem 0x0000013C3CEA2D40
LogFileHelpers: Editor autosave (incl. sublevels) for '/Game/RBM_Prototypes/Maps/Eventide_Level1' took 0.200
OBJ SavePackage: Generating thumbnails for [1] asset(s) in package [/Game/RBM_Prototypes/Pickups/m_HealthPickup] ([1] browsable assets)...
OBJ SavePackage:     Rendered thumbnail for [Material /Game/RBM_Prototypes/Pickups/m_HealthPickup.m_HealthPickup]
OBJ SavePackage: Finished generating thumbnails for package [/Game/RBM_Prototypes/Pickups/m_HealthPickup]
LogSavePackage: Save=27.522030ms
LogSavePackage: Moving '../../../../../../Users/brandon/Desktop/0415/Eventide_Package/Saved/m_HealthPickup_Auto8631306A346E7A63125F9F9B1E54BDB9D.tmp' to '../../../../../../Users/brandon/Desktop/0415/Eventide_Package/Saved/Autosaves/Game/RBM_Prototypes/Pickups/m_HealthPickup_Auto8.uasset'
LogSavePackage: Total save time: 65.785419ms
LogSavePackage:Display: Finished SavePackage ../../../../../../Users/brandon/Desktop/0415/Eventide_Package/Saved/Autosaves/Game/RBM_Prototypes/Pickups/m_HealthPickup_Auto8.uasset
OBJ SavePackage: Generating thumbnails for [1] asset(s) in package [/Game/RBM_Prototypes/Pickups/M_pickupPaint] ([1] browsable assets)...
OBJ SavePackage:     Rendered thumbnail for [Material /Game/RBM_Prototypes/Pickups/M_pickupPaint.M_pickupPaint]
OBJ SavePackage: Finished generating thumbnails for package [/Game/RBM_Prototypes/Pickups/M_pickupPaint]
LogSavePackage: Save=21.721773ms
LogSavePackage: Moving '../../../../../../Users/brandon/Desktop/0415/Eventide_Package/Saved/M_pickupPaint_Auto80796C0B54D25387C7A6ADFACFE24B05D.tmp' to '../../../../../../Users/brandon/Desktop/0415/Eventide_Package/Saved/Autosaves/Game/RBM_Prototypes/Pickups/M_pickupPaint_Auto8.uasset'
LogSavePackage: Total save time: 32.469120ms
LogSavePackage:Display: Finished SavePackage ../../../../../../Users/brandon/Desktop/0415/Eventide_Package/Saved/Autosaves/Game/RBM_Prototypes/Pickups/M_pickupPaint_Auto8.uasset
OBJ SavePackage: Generating thumbnails for [1] asset(s) in package [/Game/RBM_Prototypes/Pickups/m_HealthPickup2] ([1] browsable assets)...
OBJ SavePackage:     Rendered thumbnail for [Material /Game/RBM_Prototypes/Pickups/m_HealthPickup2.m_HealthPickup2]
OBJ SavePackage: Finished generating thumbnails for package [/Game/RBM_Prototypes/Pickups/m_HealthPickup2]
LogSavePackage: Save=19.131907ms
LogSavePackage: Moving '../../../../../../Users/brandon/Desktop/0415/Eventide_Package/Saved/m_HealthPickup2_Auto85548610943F6BB82F5AD8C9398C9F795.tmp' to '../../../../../../Users/brandon/Desktop/0415/Eventide_Package/Saved/Autosaves/Game/RBM_Prototypes/Pickups/m_HealthPickup2_Auto8.uasset'
LogSavePackage: Total save time: 29.049605ms
LogSavePackage:Display: Finished SavePackage ../../../../../../Users/brandon/Desktop/0415/Eventide_Package/Saved/Autosaves/Game/RBM_Prototypes/Pickups/m_HealthPickup2_Auto8.uasset
LogFileHelpers: Auto-saving content packages took 0.221
MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: [2016.04.18-10.43.50:199][  0]LogPhysics:Warning: PHYSX: ..\..\PhysX\src\NpScene.cpp (2946) 8 : PxScene::unlockWrite() called without matching call to PxScene::lockWrite(), behaviour will be undefined.
MainFrameActions: Packaging (Windows (64-bit)): CommandUtils.Run: Run: Took 35.5560305s to run UE4Editor-Cmd.exe, ExitCode=3
MainFrameActions: Packaging (Windows (64-bit)): Project.Cook: Cook failed. Deleting cooked data.
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: Cook failed.
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(Action`1 Main, Object Param)
MainFrameActions: Packaging (Windows (64-bit)):    at AutomationTool.Program.Main()InnerException in AutomationUtils.Automation: BUILD FAILED: Failed while running Cook for C:\Users\brandon\Desktop\0415\Eventide_Package\Eventide_Package.uproject; see log C:\Users\brandon\AppData\Roaming\Unreal Engine\AutomationTool\Logs\C+Program+Files+Epic+Games+4.10\Cook-2016.04.18-06.44.01.txt
MainFrameActions: Packaging (Windows (64-bit)): Stacktrace:    at AutomationTool.CommandUtils.RunCommandlet(String ProjectName, String UE4Exe, String Commandlet, String Parameters)
MainFrameActions: Packaging (Windows (64-bit)):    at Project.Cook(ProjectParams Param
MainFrameActions: Packaging (Windows (64-bit)): s)
MainFrameActions: Packaging (Windows (64-bit)): ProcessManager.KillAll: Trying to kill 0 spawned processes.
MainFrameActions: Packaging (Windows (64-bit)): Program.Main: AutomationTool exiting with ExitCode=Error_UnknownCookFailure
MainFrameActions: Packaging (Windows (64-bit)): Domain_ProcessExit
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
PackagingResults:Error: Error Unknown Cook Failure

Hey Rbmiracle,

Could you please try to package a new template in 4.10 as well as 4.11.2? If they fail, please upload the error output logs as a .txt file separately with your next reply. Try opening your project in 4.11.2 (do not convert it, just create a copy of it when it asks) and package your project. Upload those error logs for me too.

Thank you!

Hey Rbmiracle,

We have not heard back from you in a few days, so we are marking this post as Resolved for tracking purposes. If you are still experiencing the issue you reported, please respond to this message with additional information and we will offer further assistance.

Thank you!