Problems updating project to 4.4

I was able to successfully compile code in VS which I was not able to before . It does not say the the module needs to be recompiled or is out of date . When I load the editor it crashes .

This is the crash log .

!Id:e99b4f2873ddb4e8aaf6e6f43f25976f

Unknown exception - code 00000001 (first/second chance not available)

Assertion failed: GameViewportClientClass != NULL [File:D:\BuildFarm\buildmachine_++depot+UE4-Releases+4.4\Engine\Source\Runtime\Engine\Private\UnrealEngine.cpp] [Line: 1322]
Engine config value GameViewportClientClassName is not a valid class n

KERNELBASE + 37901 bytes
UE4Editor_Core + 3095292 bytes
UE4Editor_Core + 1661738 bytes
UE4Editor_Core + 1541824 bytes
UE4Editor_Engine + 9016655 bytes
UE4Editor_UnrealEd + 1712495 bytes
UE4Editor_Engine + 9004409 bytes
UE4Editor_UnrealEd + 1708367 bytes
UE4Editor_UnrealEd + 1700548 bytes
UE4Editor_UnrealEd + 5772394 bytes
UE4Editor!FEngineLoop::Init() + 526 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.4\engine\source\runtime\launch\private\launchengineloop.cpp:1871]
UE4Editor_UnrealEd + 5627284 bytes
UE4Editor!GuardedMain() + 285 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.4\engine\source\runtime\launch\private\launch.cpp:125]
UE4Editor!GuardedMainWrapper() + 26 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.4\engine\source\runtime\launch\private\windows\launchwindows.cpp:125]
UE4Editor!WinMain() + 249 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.4\engine\source\runtime\launch\private\windows\launchwindows.cpp:201]
UE4Editor!__tmainCRTStartup() + 329 bytes [f:\dd\vctools\crt\crtw32\dllstuff\crtexe.c:618]