Fortnite crashing when loading on about 65%

As the title says, my UEFN is crashing when I try and load into it. The messaging in the dark grey/black Crash Reporter box states:
LoginId:47784a69401eca-----------0985a12
EpicAccountId:65fc6364cb04----------c1018f55c409

Fatal error: [File:Z:\UEVFS\FortniteGame\Source\FortniteGame\Private\FortAssetManager.cpp] [Line: 1306]
Failed to load GameData asset at /Game/Balance/DefaultGameDataCommon.DefaultGameDataCommon. Type FortGameData. This is not recoverable and likely means you do not have the correct data to run Fortnite.

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
UnrealEditorFortnite_Win64_Shipping
UnrealEditorFortnite_Win64_Shipping
UnrealEditorFortnite_Win64_Shipping
UnrealEditorFortnite_Win64_Shipping
UnrealEditorFortnite_Win64_Shipping
UnrealEditorFortnite_Win64_Shipping
kernel32
ntdll