An UEFN Start Up Error

General Issues and Bug Reporting
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LoginId:9a5716794a71bb21e425c5a40215c4ce
EpicAccountId:8ca8d8ea35cf47e68a58b9beb2ce6024

Fatal error: [File:D:\build++Fortnite\Sync\Engine\Source\Runtime\PakFile\Private\IPlatformFilePak.cpp] [Line: 5561] Corrupt pak index detected on pak file: …/…/…/FortniteGame/Content/Paks/pakchunkscb_ExtRefoptional-WindowsClient.pak

UnrealEditorFortnite_Win64_Shipping
UnrealEditorFortnite_Win64_Shipping
UnrealEditorFortnite_Win64_Shipping
UnrealEditorFortnite_Win64_Shipping
UnrealEditorFortnite_Win64_Shipping
UnrealEditorFortnite_Win64_Shipping
UnrealEditorFortnite_Win64_Shipping
UnrealEditorFortnite_Win64_Shipping
UnrealEditorFortnite_Win64_Shipping
UnrealEditorFortnite_Win64_Shipping
UnrealEditorFortnite_Win64_Shipping
UnrealEditorFortnite_Win64_Shipping
kernel32
ntdll

2

Please try verifying your Fortnite/UEFN files in the Epic Games Launcher.

3

I verified it but nothing happen the same

4

I verified it but nothing happen the same…Here is the full crash document

Reading toc: …/…/…/FortniteGame/Content/Paks/global.utoc
Toc signature hash: B869C9A90D0306520C522C926A57EC9295D0047D
Mounting container ‘…/…/…/FortniteGame/Content/Paks/global.utoc’ in location slot 0
Initialized I/O dispatcher file backend. Mounted the global container: …/…/…/FortniteGame/Content/Paks/global.utoc
Found Pak file …/…/…/FortniteGame/Content/Paks/UEFNFortniteGame-WindowsUEFN.pak attempting to mount.
Mounting pak file …/…/…/FortniteGame/Content/Paks/UEFNFortniteGame-WindowsUEFN.pak.
Reading toc: …/…/…/FortniteGame/Content/Paks/UEFNFortniteGame-WindowsUEFN.utoc
Toc signature hash: 783EB95F123B8933ADEA1963E871C716AE56C8E9
Mounting container ‘…/…/…/FortniteGame/Content/Paks/UEFNFortniteGame-WindowsUEFN.utoc’ in location slot 0
Mounted IoStore container “…/…/…/FortniteGame/Content/Paks/UEFNFortniteGame-WindowsUEFN.utoc”
Reading toc: …/…/…/FortniteGame/Content/Paks/UEFNFortniteGame-WindowsUEFN.o.utoc
Toc signature hash: 973E39B0C644FA1A3B383761E5960CED34B0DA06
Mounting container ‘…/…/…/FortniteGame/Content/Paks/UEFNFortniteGame-WindowsUEFN.o.utoc’ in location slot 0
Mounted optional segment extension IoStore container “…/…/…/FortniteGame/Content/Paks/UEFNFortniteGame-WindowsUEFN.o.utoc”
Mounted Pak file ‘…/…/…/FortniteGame/Content/Paks/UEFNFortniteGame-WindowsUEFN.pak’, mount point: ‘…/…/…/’
Found Pak file …/…/…/FortniteGame/Content/Paks/pakchunkscb_ExtRefoptional-WindowsClient.pak attempting to mount.
Mounting pak file …/…/…/FortniteGame/Content/Paks/pakchunkscb_ExtRefoptional-WindowsClient.pak.
Corrupt pak PrimaryIndex detected!
Filename: …/…/…/FortniteGame/Content/Paks/pakchunkscb_ExtRefoptional-WindowsClient.pak
Encrypted: 1
Total Size: 365
Index Offset: 0
Index Size: 112
Stored Index Hash: 1392A4149A547DCA8D72DEB1005E8301F203D0CB
Computed Index Hash: 354E8E88FE285797B69D9C72575B9697CF35E305
Corrupt pak PrimaryIndex detected!
Filename: …/…/…/FortniteGame/Content/Paks/pakchunkscb_ExtRefoptional-WindowsClient.pak
Encrypted: 1
Total Size: 365
Index Offset: 0
Index Size: 112
Stored Index Hash: 1392A4149A547DCA8D72DEB1005E8301F203D0CB
Computed Index Hash: 354E8E88FE285797B69D9C72575B9697CF35E305
appError called: Fatal error: [File:D:\build++Fortnite\Sync\Engine\Source\Runtime\PakFile\Private\IPlatformFilePak.cpp] [Line: 5561]
Corrupt pak index detected on pak file: …/…/…/FortniteGame/Content/Paks/pakchunkscb_ExtRefoptional-WindowsClient.pak

Windows GetLastError: The operation completed successfully. (0)

5

I deleted this file and verified it then it worked successfully
pakchunkscb_ExtRefoptional-WindowsClient.pak

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