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Critical error,why

1,
[2017.10.03-22.58.21:008][985]LogWindows: Error: === Critical error: ===
[2017.10.03-22.58.21:008][985]LogWindows: Error:
[2017.10.03-22.58.21:008][985]LogWindows: Error: Assertion failed: !Export.SuperIndex.IsNull() [File:D:\UnrealEngine-release4.17\Engine\Source\Runtime\CoreUObject\Private\UObject\SavePackage.cpp] [Line: 4620]
[2017.10.03-22.58.21:008][985]LogWindows: Error: Export Struct (ReceiveTick) of type (Function) inheriting from (ReceiveTick) of type (Function) has not mapped super struct.

2,
[2017.10.03-23.42.20:856][581]LogWindows: Error: === Critical error: ===
[2017.10.03-23.42.20:857][581]LogWindows: Error:
[2017.10.03-23.42.20:857][581]LogWindows: Error: Assertion failed: Property->PropertyFlags & CPF_Net [File:D:\UnrealEngine-release4.17\Engine\Source\Runtime\Engine\Private\RepLayout.cpp] [Line: 2974]
[2017.10.03-23.42.20:857][581]LogWindows: Error:

In what relationship does this error happen? Do you Change something, c++ or blueprints?