[For now, I dont think this error could easily be solved. I will just return to use live coding. ] Every time I finish Compelling some change in the source, When I end the play in the editor, The game crash.

[john012343210]

When you try to compile the code and write the IDE, if after the Terminal in the IDE signal, the compile is finished, but the engine does not beep a sound Immediately, It is likely that this bug happened.

`LoginId:d136ee2f4965b641325b0babb5335373 EpicAccountId:32550fbdab1c434399c0ce8a86d54173

Assertion failed: Index >= 0 [File:D:\build++UE5\Sync\Engine\Source\Runtime\CoreUObject\Public\UObject\UObjectArray.h] [Line: 727]

UnrealEditor_UnrealEd!TObjectIteratorBase<1>::operator++() [D:\build++UE5\Sync\Engine\Source\Runtime\CoreUObject\Public\UObject\UObjectIterator.h:180] UnrealEditor_UnrealEd!UEditorEngine::EndPlayMap() [D:\build++UE5\Sync\Engine\Source\Editor\UnrealEd\Private\PlayLevel.cpp:398] UnrealEditor_UnrealEd!UEditorEngine::Tick() [D:\build++UE5\Sync\Engine\Source\Editor\UnrealEd\Private\EditorEngine.cpp:2227] UnrealEditor_UnrealEd!UUnrealEdEngine::Tick() [D:\build++UE5\Sync\Engine\Source\Editor\UnrealEd\Private\UnrealEdEngine.cpp:519] UnrealEditor!FEngineLoop::Tick() [D:\build++UE5\Sync\Engine\Source\Runtime\Launch\Private\LaunchEngineLoop.cpp:5812] UnrealEditor!GuardedMain() [D:\build++UE5\Sync\Engine\Source\Runtime\Launch\Private\Launch.cpp:188] UnrealEditor!GuardedMainWrapper() [D:\build++UE5\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:107] UnrealEditor!LaunchWindowsStartup() [D:\build++UE5\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:244] UnrealEditor!WinMain() [D:\build++UE5\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:284] UnrealEditor!__scrt_common_main_seh() [D:\a_work\1\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:288] kernel32 ntdll`

C:\Program Files\Epic Games\UE_5.2\Engine\Source\Editor\UnrealEd\Private

Either enabled the symbol of debugging to track what happened.

Or

Try to start a new project and migrate to that new project.

[john012343210]

It is checked that the spark already appear in the very beginning of the project c3900d8054133572558726c7cb28f24bf7c8ac3b

C:\Users\whouse\Desktop\unreal\UE5_NBodySimulationBUGtest2

[john012343210]

Taking one more step backward, we directly try the original reference project. https://github.com/[MatthisL/UE5_NBodySimulation](https://github.com/MatthisL/UE5_NBodySimulation)

C:\Users\whouse\Desktop\unreal\UE5_NBodySimulationBUGtest3

It is also tested with this bug.

[john012343210]

It is tested if I start a blank template project in UE 5.2. This problem will not appear. C:\Users\whouse\Desktop\unreal\NBodySimulation

[john012343210]

Also, maybe we start to migrate the old things to the new template project.

https://github.com/ProgramIsFun/ue5-force-graph/commit/bc336619fa96f85d01b6b8e9ad18a521d79e5f71

[john012343210]

Adding the utility CPP and header Will not have the bug.

But after adding all the other CPP , it seems bug happens. The following is a compound message, which the bug will happen.

CONSOLE: Use build tool: C:\Program Files\Microsoft Visual Studio\2022\Community\MSBuild\Current\Bin\amd64\MSBuild.exe 7:19:07 PM Building C:\Users\whouse\Desktop\unreal\NBodySimulation\Intermediate\ProjectFiles\NBodySimulation.vcxproj "C:\Program Files\Epic Games\UE_5.2\Engine\Build\BatchFiles\Build.bat" NBodySimulationEditor Win64 Development -Project="C:\Users\whouse\Desktop\unreal\NBodySimulation\NBodySimulation.uproject" -WaitMutex -FromMsBuild Using bundled DotNet SDK version: 6.0.302 Running UnrealBuildTool: dotnet "..\..\Engine\Binaries\DotNET\UnrealBuildTool\UnrealBuildTool.dll" NBodySimulationEditor Win64 Development -Project="C:\Users\whouse\Desktop\unreal\NBodySimulation\NBodySimulation.uproject" -WaitMutex -FromMsBuild Log file: C:\Users\whouse\AppData\Local\UnrealBuildTool\Log.txt Using 'git status' to determine working set for adaptive non-unity build (C:\Users\whouse\Desktop\unreal\NBodySimulation). Building NBodySimulationEditor... Using Visual Studio 2022 14.41.34123 toolchain (C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.41.34120) and Windows 10.0.18362.0 SDK (C:\Program Files (x86)\Windows Kits\10). [Upgrade] [Upgrade] Using backward-compatible include order. The latest version of UE has changed the order of includes, which may require code changes. The current setting is: [Upgrade] IncludeOrderVersion = EngineIncludeOrderVersion.Unreal5_1 [Upgrade] Suppress this message by setting 'IncludeOrderVersion = EngineIncludeOrderVersion.Unreal5_2;' in NBodySimulationEditor.Target.cs. [Upgrade] Alternatively you can set this to 'EngineIncludeOrderVersion.Latest' to always use the latest include order. This will potentially cause compile errors when integrating new versions of the engine. [Upgrade] [Adaptive Build] Excluded from NBodySimulation unity file: KnowledgeEdge.cpp, KnowledgeGraph.cpp, KnowledgeGraph2.cpp, KnowledgeGraph3.cpp, KnowledgeNode.cpp, NBodySimulation.cpp, octreeeeeeeeee3.cpp, octreeeeeeeeee4.cpp, utillllllssss.cpp Determining max actions to execute in parallel (10 physical cores, 20 logical cores) Executing up to 10 processes, one per physical core Building 8 actions with 8 processes... [1/8] Link [x64] UnrealEditor-NBodySim-0006.lib Creating library C:\Users\whouse\Desktop\unreal\NBodySimulation\Plugins\NBodySimShader\Intermediate\Build\Win64\x64\UnrealEditor\Development\NBodySim\UnrealEditor-NBodySim-0006.lib and object C:\Users\whouse\Desktop\unreal\NBodySimulation\Plugins\NBodySimShader\Intermediate\Build\Win64\x64\UnrealEditor\Development\NBodySim\UnrealEditor-NBodySim-0006.exp [2/8] Link [x64] UnrealEditor-BasePlugin-0006.lib Creating library C:\Users\whouse\Desktop\unreal\NBodySimulation\Plugins\NBodySimShader\Intermediate\Build\Win64\x64\UnrealEditor\Development\BasePlugin\UnrealEditor-BasePlugin-0006.lib and object C:\Users\whouse\Desktop\unreal\NBodySimulation\Plugins\NBodySimShader\Intermediate\Build\Win64\x64\UnrealEditor\Development\BasePlugin\UnrealEditor-BasePlugin-0006.exp [3/8] Link [x64] UnrealEditor-BasePlugin-0006.dll Creating library C:\Users\whouse\Desktop\unreal\NBodySimulation\Plugins\NBodySimShader\Intermediate\Build\Win64\x64\UnrealEditor\Development\BasePlugin\UnrealEditor-BasePlugin-0006.suppressed.lib and object C:\Users\whouse\Desktop\unreal\NBodySimulation\Plugins\NBodySimShader\Intermediate\Build\Win64\x64\UnrealEditor\Development\BasePlugin\UnrealEditor-BasePlugin-0006.suppressed.exp [4/8] Link [x64] UnrealEditor-NBodySim-0006.dll Creating library C:\Users\whouse\Desktop\unreal\NBodySimulation\Plugins\NBodySimShader\Intermediate\Build\Win64\x64\UnrealEditor\Development\NBodySim\UnrealEditor-NBodySim-0006.suppressed.lib and object C:\Users\whouse\Desktop\unreal\NBodySimulation\Plugins\NBodySimShader\Intermediate\Build\Win64\x64\UnrealEditor\Development\NBodySim\UnrealEditor-NBodySim-0006.suppressed.exp [5/8] Compile [x64] KnowledgeGraph.cpp 0>KnowledgeGraph.cpp(132): Warning C4457 : declaration of 'DeltaTime' hides function parameter 0>KnowledgeGraph.cpp(69): Reference C4457 : see declaration of 'DeltaTime' [6/8] Link [x64] UnrealEditor-NBodySimulation-0006.lib Creating library C:\Users\whouse\Desktop\unreal\NBodySimulation\Intermediate\Build\Win64\x64\UnrealEditor\Development\NBodySimulation\UnrealEditor-NBodySimulation-0006.lib and object C:\Users\whouse\Desktop\unreal\NBodySimulation\Intermediate\Build\Win64\x64\UnrealEditor\Development\NBodySimulation\UnrealEditor-NBodySimulation-0006.exp [7/8] Link [x64] UnrealEditor-NBodySimulation-0006.dll Creating library C:\Users\whouse\Desktop\unreal\NBodySimulation\Intermediate\Build\Win64\x64\UnrealEditor\Development\NBodySimulation\UnrealEditor-NBodySimulation-0006.suppressed.lib and object C:\Users\whouse\Desktop\unreal\NBodySimulation\Intermediate\Build\Win64\x64\UnrealEditor\Development\NBodySimulation\UnrealEditor-NBodySimulation-0006.suppressed.exp [8/8] WriteMetadata NBodySimulationEditor.target Total time in Parallel executor: 2.69 seconds Total execution time: 4.32 seconds

[john012343210]

For now, I dont think this error could easily be solved. I will just return to use live coding.