[File:D:\build++UE5\Sync\LocalInstall\Engine\Source\Runtime\Slate\Public\Framework\Application\SlateApplication.h] [Line: 256]

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UATHelper: Packaging (Windows): LogWindows: Error: appError called: Assertion failed: CurrentApplication.IsValid() [File:D:\build++UE5\Sync\LocalInstall\Engine\Source\Runtime\Slate\Public\Framework\Application\SlateApplication.h] [Line: 256]
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: CurrentApplication.IsValid() [File:D:\build++UE5\Sync\LocalInstall\Engine\Source\Runtime\Slate\Public\Framework\Application\SlateApplication.h] [Line: 256]
UATHelper: Packaging (Windows): LogWindows: Error:
UATHelper: Packaging (Windows): LogWindows: Error:
UATHelper: Packaging (Windows): LogWindows: Error:
UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x0000027a606648a4 UnrealEditor-Fab.dll!FSlateApplication::Get() [D:\build++UE5\Sync\LocalInstall\Engine\Source\Runt

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it would be helpful if you share more details