Unreal Engine 5.2 Packaging failed! Assertion failed: NiagaraGraph.cpp [Line: 4140]

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Greetings guys, hope to find you well. I was trying to package my game developed on UE 5.2.1, never had such a weird packaging fatal error (see logs attached).

I usually manage to fix up any error that gets thrown at me, but this one truly leaves me baffled, so much so that I need to ask for help here on the forum, hope to find a solution for my situation and for anyone who could end up in the same situation in the future!

Thanks in advance for any help I’ll get!

-Amarthir

UATHelper: Packaging (Windows): Script Stack (0 frames) :
UATHelper: Packaging (Windows): LogWindows: Error: appError called: Assertion failed: !bIsForCompilationOnly [File:D:\build\++UE5\Sync\Engine\Plugins\FX\Niagara\Source\NiagaraEditor\Private\NiagaraGraph.cpp] [Line: 4140]
UATHelper: Packaging (Windows): LogWindows: Error: begin: stack for UAT
UATHelper: Packaging (Windows): LogWindows: Error: === Critical error: ===
UATHelper: Packaging (Windows): LogWindows: Error:
UATHelper: Packaging (Windows): LogWindows: Error: Assertion failed: !bIsForCompilationOnly [File:D:\build\++UE5\Sync\Engine\Plugins\FX\Niagara\Source\NiagaraEditor\Private\NiagaraGraph.cpp] [Line: 4140]
UATHelper: Packaging (Windows): LogWindows: Error:
UATHelper: Packaging (Windows): LogWindows: Error:
UATHelper: Packaging (Windows): LogWindows: Error:
UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007ffe6d545e90 UnrealEditor-NiagaraEditor.dll!UnknownFunction []
UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007ffe6d6b28f7 UnrealEditor-NiagaraEditor.dll!UnknownFunction []
UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007ffe9c11bda0 UnrealEditor-CoreUObject.dll!UnknownFunction []
UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007ffe9c28a0b4 UnrealEditor-CoreUObject.dll!UnknownFunction []
UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007ffe9c288cd6 UnrealEditor-CoreUObject.dll!UnknownFunction []
UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007ffe6d4f33d7 UnrealEditor-NiagaraEditor.dll!UnknownFunction []
UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007ffe6d67bb13 UnrealEditor-NiagaraEditor.dll!UnknownFunction []
UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007ffe6d3e969d UnrealEditor-NiagaraEditor.dll!UnknownFunction []
UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007ffe6d3e913b UnrealEditor-NiagaraEditor.dll!UnknownFunction []
UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007ffe6d3e53b6 UnrealEditor-NiagaraEditor.dll!UnknownFunction []
UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007ffe6d4a46cd UnrealEditor-NiagaraEditor.dll!UnknownFunction []
UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007ffe6d3ee246 UnrealEditor-NiagaraEditor.dll!UnknownFunction []
UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007ffe6ee23464 UnrealEditor-Niagara.dll!UnknownFunction []
UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007ffe6e9b3e84 UnrealEditor-Niagara.dll!UnknownFunction []
UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007ffe6e9e4e0b UnrealEditor-Niagara.dll!UnknownFunction []
UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007ffe6e9e655d UnrealEditor-Niagara.dll!UnknownFunction []
UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007ffe6e9e7bde UnrealEditor-Niagara.dll!UnknownFunction []
UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007ffe6ef990f9 UnrealEditor-Niagara.dll!UnknownFunction []
UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007ffe6efbeca9 UnrealEditor-Niagara.dll!UnknownFunction []
UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007ffe9347ca6c UnrealEditor-UnrealEd.dll!UnknownFunction []
UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007ffe93427467 UnrealEditor-UnrealEd.dll!UnknownFunction []
UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007ffe9346a319 UnrealEditor-UnrealEd.dll!UnknownFunction []
UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007ffe93469e3a UnrealEditor-UnrealEd.dll!UnknownFunction []
UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007ffe9346f01a UnrealEditor-UnrealEd.dll!UnknownFunction []
UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007ffe93486118 UnrealEditor-UnrealEd.dll!UnknownFunction []
UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007ffe93485a3a UnrealEditor-UnrealEd.dll!UnknownFunction []
UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007ffe931c5312 UnrealEditor-UnrealEd.dll!UnknownFunction []
UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007ffe931e43b1 UnrealEditor-UnrealEd.dll!UnknownFunction []
UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007ff62a7cd0de UnrealEditor-Cmd.exe!UnknownFunction []
UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007ff62a7c454b UnrealEditor-Cmd.exe!UnknownFunction []
UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007ff62a7c482a UnrealEditor-Cmd.exe!UnknownFunction []
UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007ff62a7c74f0 UnrealEditor-Cmd.exe!UnknownFunction []
UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007ff62a7da4c4 UnrealEditor-Cmd.exe!UnknownFunction []
UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007ff62a7dcb76 UnrealEditor-Cmd.exe!UnknownFunction []
UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007ffefd8e26ad KERNEL32.DLL!UnknownFunction []
UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007ffeff04aa68 ntdll.dll!UnknownFunction []
UATHelper: Packaging (Windows): LogWindows: Error:
UATHelper: Packaging (Windows): LogWindows: Error: end: stack for UAT
PackagingResults: Error: appError called: Assertion failed: !bIsForCompilationOnly [File:D:\build\++UE5\Sync\Engine\Plugins\FX\Niagara\Source\NiagaraEditor\Private\NiagaraGraph.cpp] [Line: 4140]
PackagingResults: Error: begin: stack for UAT
PackagingResults: Error: === Critical error: ===
PackagingResults: Error: Assertion failed: !bIsForCompilationOnly [File:D:\build\++UE5\Sync\Engine\Plugins\FX\Niagara\Source\NiagaraEditor\Private\NiagaraGraph.cpp] [Line: 4140]
PackagingResults: Error: [Callstack] 0x00007ffe6d545e90 UnrealEditor-NiagaraEditor.dll!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00007ffe6d6b28f7 UnrealEditor-NiagaraEditor.dll!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00007ffe9c11bda0 UnrealEditor-CoreUObject.dll!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00007ffe9c28a0b4 UnrealEditor-CoreUObject.dll!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00007ffe9c288cd6 UnrealEditor-CoreUObject.dll!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00007ffe6d4f33d7 UnrealEditor-NiagaraEditor.dll!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00007ffe6d67bb13 UnrealEditor-NiagaraEditor.dll!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00007ffe6d3e969d UnrealEditor-NiagaraEditor.dll!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00007ffe6d3e913b UnrealEditor-NiagaraEditor.dll!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00007ffe6d3e53b6 UnrealEditor-NiagaraEditor.dll!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00007ffe6d4a46cd UnrealEditor-NiagaraEditor.dll!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00007ffe6d3ee246 UnrealEditor-NiagaraEditor.dll!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00007ffe6ee23464 UnrealEditor-Niagara.dll!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00007ffe6e9b3e84 UnrealEditor-Niagara.dll!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00007ffe6e9e4e0b UnrealEditor-Niagara.dll!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00007ffe6e9e655d UnrealEditor-Niagara.dll!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00007ffe6e9e7bde UnrealEditor-Niagara.dll!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00007ffe6ef990f9 UnrealEditor-Niagara.dll!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00007ffe6efbeca9 UnrealEditor-Niagara.dll!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00007ffe9347ca6c UnrealEditor-UnrealEd.dll!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00007ffe93427467 UnrealEditor-UnrealEd.dll!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00007ffe9346a319 UnrealEditor-UnrealEd.dll!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00007ffe93469e3a UnrealEditor-UnrealEd.dll!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00007ffe9346f01a UnrealEditor-UnrealEd.dll!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00007ffe93486118 UnrealEditor-UnrealEd.dll!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00007ffe93485a3a UnrealEditor-UnrealEd.dll!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00007ffe931c5312 UnrealEditor-UnrealEd.dll!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00007ffe931e43b1 UnrealEditor-UnrealEd.dll!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00007ff62a7cd0de UnrealEditor-Cmd.exe!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00007ff62a7c454b UnrealEditor-Cmd.exe!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00007ff62a7c482a UnrealEditor-Cmd.exe!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00007ff62a7c74f0 UnrealEditor-Cmd.exe!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00007ff62a7da4c4 UnrealEditor-Cmd.exe!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00007ff62a7dcb76 UnrealEditor-Cmd.exe!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00007ffefd8e26ad KERNEL32.DLL!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00007ffeff04aa68 ntdll.dll!UnknownFunction []
PackagingResults: Error: end: stack for UAT
UATHelper: Packaging (Windows): Took 1085.5360312999999s to run UnrealEditor-Cmd.exe, ExitCode=3
UATHelper: Packaging (Windows): ERROR: Cook failed.
UATHelper: Packaging (Windows):        (see C:\Users\Amarthir\AppData\Roaming\Unreal Engine\AutomationTool\Logs\C+Program+Files+Epic+Games+UE_5.2\Log.txt for full exception trace)
PackagingResults: Error: Cook failed.
UATHelper: Packaging (Windows): AutomationTool executed for 0h 18m 17s
UATHelper: Packaging (Windows): AutomationTool exiting with ExitCode=25 (Error_UnknownCookFailure)
UATHelper: Packaging (Windows): BUILD FAILED
PackagingResults: Error: Unknown Cook Failure
LogViewport: Scene viewport resized to 1242x2124, mode Windowed.
2

Problem solved!

In order to avoid this issue, especially when upgrading your project to newer versions of Unreal Engine, even more so if you have migrated content from other projects / marketplace assets / demo samples, check all your Niagara Systems (in Editor, get yourself to the root folder, filter by Niagara System and check your assets one by one).

You will surely find a Niagara System with Modules missing or with compiling errors: based upon the errors it flags, you might need to delete / recreate that Niagara System.

In my specific case, a migrated Niagara System, upon opening it, crashed the editor right away. In that case, you might just need to delete it and recreate it in case you have a working backup of your project from which you can check what you made prior to the engine upgrade.

Hope this helps anyone having similar issues!

Regards,
Amarthir.

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