Fatal error by loading LandscapeSublevel

Hi there, I am using the Ark Dev Kit and have since a few hours a Fatal Error when I try to load my LandscapeSublevel:

Fatal error!

Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0x00000008

VERSION: 0.0 
UE4Editor-CoreUObject.dll!UnknownFunction (0x00007fffbe29b9bf) + 0 bytes [UnknownFile:0]
UE4Editor-Engine.dll!UnknownFunction (0x00007fff4da7b7fc) + 0 bytes [UnknownFile:0]
UE4Editor-CoreUObject.dll!UnknownFunction (0x00007fffbe29bb3e) + 0 bytes [UnknownFile:0]
UE4Editor-CoreUObject.dll!UnknownFunction (0x00007fffbe22e907) + 0 bytes [UnknownFile:0]
UE4Editor-CoreUObject.dll!UnknownFunction (0x00007fffbe25ae31) + 0 bytes [UnknownFile:0]
UE4Editor-CoreUObject.dll!UnknownFunction (0x00007fffbe232a65) + 0 bytes [UnknownFile:0]
UE4Editor-CoreUObject.dll!UnknownFunction (0x00007fffbe2020c2) + 0 bytes [UnknownFile:0]
UE4Editor-Engine.dll!UnknownFunction (0x00007fff4d26e33a) + 0 bytes [UnknownFile:0]
UE4Editor-Engine.dll!UnknownFunction (0x00007fff4d78ee31) + 0 bytes [UnknownFile:0]
UE4Editor-Engine.dll!UnknownFunction (0x00007fff4d78e58c) + 0 bytes [UnknownFile:0]
UE4Editor-Engine.dll!UnknownFunction (0x00007fff4d74c741) + 0 bytes [UnknownFile:0]
UE4Editor-WorldBrowser.dll!UnknownFunction (0x00007fff44219c3b) + 0 bytes [UnknownFile:0]
UE4Editor-WorldBrowser.dll!UnknownFunction (0x00007fff44219e99) + 0 bytes [UnknownFile:0]
UE4Editor-WorldBrowser.dll!UnknownFunction (0x00007fff4421ab04) + 0 bytes [UnknownFile:0]
UE4Editor-WorldBrowser.dll!UnknownFunction (0x00007fff4423e7c5) + 0 bytes [UnknownFile:0]
UE4Editor-WorldBrowser.dll!UnknownFunction (0x00007fff441d0e46) + 0 bytes [UnknownFile:0]
UE4Editor-WorldBrowser.dll!UnknownFunction (0x00007fff441d78bb) + 0 bytes [UnknownFile:0]
UE4Editor-WorldBrowser.dll!UnknownFunction (0x00007fff441d5ef6) + 0 bytes [UnknownFile:0]
UE4Editor-WorldBrowser.dll!UnknownFunction (0x00007fff4424940f) + 0 bytes [UnknownFile:0]
UE4Editor-WorldBrowser.dll!UnknownFunction (0x00007fff4423066f) + 0 bytes [UnknownFile:0]
ntdll.dll!UnknownFunction (0x00007fffe6b6ce51) + 0 bytes [UnknownFile:0]
UE4Editor-Slate.dll!UnknownFunction (0x00007fffbbc82f95) + 0 bytes [UnknownFile:0]
UE4Editor-Slate.dll!UnknownFunction (0x00007fffbbc6ed00) + 0 bytes [UnknownFile:0]
UE4Editor-Core.dll!UnknownFunction (0x00007fffbc25d8b8) + 0 bytes [UnknownFile:0]
UE4Editor-Core.dll!UnknownFunction (0x00007fffbc239f9b) + 0 bytes [UnknownFile:0]
UE4Editor-Core.dll!UnknownFunction (0x00007fffbc25ebd9) + 0 bytes [UnknownFile:0]
UE4Editor-Core.dll!UnknownFunction (0x00007fffbc233dd9) + 0 bytes [UnknownFile:0]
USER32.dll!UnknownFunction (0x00007fffe65d5c7d) + 0 bytes [UnknownFile:0]
USER32.dll!UnknownFunction (0x00007fffe65d5672) + 0 bytes [UnknownFile:0]
UE4Editor-Core.dll!UnknownFunction (0x00007fffbc25f936) + 0 bytes [UnknownFile:0]
UE4Editor.exe!UnknownFunction (0x00007ff6115bb018) + 0 bytes [UnknownFile:0]
UE4Editor.exe!UnknownFunction (0x00007ff6115afb2f) + 0 bytes [UnknownFile:0]
UE4Editor.exe!UnknownFunction (0x00007ff6115afb9a) + 0 bytes [UnknownFile:0]
UE4Editor.exe!UnknownFunction (0x00007ff6115bca8e) + 0 bytes [UnknownFile:0]
UE4Editor.exe!UnknownFunction (0x00007ff6115bd9c9) + 0 bytes [UnknownFile:0]
KERNEL32.DLL!UnknownFunction (0x00007fffe6967bd4) + 0 bytes [UnknownFile:0]
ntdll.dll!UnknownFunction (0x00007fffe6b6ce51) + 0 bytes [UnknownFile:0]

Is there any fix on it? I hope my work from over a month is not broken now.
Hope you could help me out and sorry for my bad english.