What is Error in "Cycle Node"?

Hi, When I Package my game i receive error Cycle Node error in my BluePrints… What is this error???

Part Log is Down

LogSavePackage:Error: Cycle Node Create:Toolkit_Page_Templates_C /Game/CMSLayouts/Functions/Toolkit_Page_Templates.Default__Toolkit_Page_Templates_C
LogSavePackage:Error: Cycle Node Serialize:Function /Game/CMSLayouts/Functions/Toolkit_DataTables.Toolkit_DataTables_C:Generate GridView
LogSavePackage:Error: Cycle Node Serialize:BlueprintGeneratedClass /Game/CMSLayouts/Functions/Toolkit_DataTables.Toolkit_DataTables_C
LogSavePackage:Error: Cycle Node Create:Toolkit_DataTables_C /Game/CMSLayouts/Functions/Toolkit_DataTables.Default__Toolkit_DataTables_C
LogSavePackage:Error: Cycle Node Serialize:Function /Game/CMSLayouts/Functions/Toolkit_Page_Templates.Toolkit_Page_Templates_C:Create Page (GridView / Details)
LogSavePackage:Error: Cycle Node Serialize:BlueprintGeneratedClass /Game/CMSLayouts/Functions/Toolkit_Page_Templates.Toolkit_Page_Templates_C
LogSavePackage:Error: ----- Create:Toolkit_Page_Templates_C /Game/CMSLayouts/Functions/Toolkit_Page_Templates.Default__Toolkit_Page_Templates_C contained a cycle (listed above).
LogLinux:Error: appError called: Assertion failed: Assertion failed:  [File:/home/crash/UnrealEngine/Engine/Source/Runtime/CoreUObject/Private/UObject/SavePackage.cpp] [Line: 3253] 
EDL dep graph contained a cycle (see errors, above). This is fatal at runtime so it is fatal at cook time.

LogLinux: === Critical error: ===
Unhandled Exception: SIGSEGV: invalid attempt to write memory at address 0x0000000000000003

LogLinux: Assertion failed: Assertion failed:  [File:/home/crash/UnrealEngine/Engine/Source/Runtime/CoreUObject/Private/UObject/SavePackage.cpp] [Line: 3253] 
EDL dep graph contained a cycle (see errors, above). This is fatal at runtime so it is fatal at cook time.

What is CMSLayouts? Do you use it as plugin, and it’s compatible with 4.16?

CMS Layouts is my Project to create online courses or animated presentations based on datatables …
When complete i send to MarketPlace …

CMS Layouts is my Project to create online courses or animated presentations based on datatables … When complete i send to MarketPlace …

Same here. I guess its something specific to 4.16. Cook worked with same project on 4.15

Found an answer. This seems to be a known bug: Unreal Engine Issues and Bug Tracker (UE-43458) To “fix” it for now you have to turn off Event Driven loader in project settings