Packaging error with UObjectGlobals [Line : 281]

Hi,
I try packaging the project, but It still same error like this.

UATHelper: Packaging (Windows (64-bit)): LogCook: Display: Cooked packages 1300 Packages Remain 3581 Total 4881
UATHelper: Packaging (Windows (64-bit)): LogMaterial: Display: Missing cached shader map for material M_Widget, compiling.
UATHelper: Packaging (Windows (64-bit)): LogOutputDevice: Warning:
UATHelper: Packaging (Windows (64-bit)):
UATHelper: Packaging (Windows (64-bit)): Script Stack (0 frames):
UATHelper: Packaging (Windows (64-bit)):
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: begin: stack for UAT
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: === Critical error: ===
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error:
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: Fatal error: [File:D:\Build++UE4\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\UObjectGlobals.cpp] [Line: 281]
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: Illegal call to StaticFindObjectFast() while serializing object data or garbage collecting!

What wrong I do?