Packaging project failed with this error, any suggestions?

This is the bottom line of the error I’m getting. The scene is very big but plays fine in the editor.

MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: [2015.11.13-15.40.11:112][ 0]LogWindows:Error: Windows GetLastError: The operation completed successfully. (0)
MainFrameActions: Packaging (Windows (64-bit)): UE4Editor-Cmd: [2015.11.13-15.40.11:467][ 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)): UE4Editor-Cmd: [2015.11.13-15.40.11:467][ 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)): UE4Editor-Cmd: [2015.11.13-15.40.11:468][ 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)): UE4Editor-Cmd: [2015.11.13-15.40.11:469][ 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 93.786s 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(List1 CommandsToExecute, CaselessDictionary1 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 D:\Jonny\Documents\Unreal Projects\Showcase_40K_Store\Showcase_40K_Store.uproject; see log C:\Users\Jonny\AppData\Roaming\Unreal Engine\AutomationTool\Logs\C+Program+Files+Epic+Games+4.9\Cook-2015.11.13-15.40.22.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
MainFrameActions: Packaging (Windows (64-bit)): Params)
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

Any help would be wonderful