Fatal error crash on startup

Development Getting Started & Setup
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Crashing on startup, any idea why?

LoginId:4716c5c54ae4d197991f158cc158d76f
EpicAccountId:e7668967e010447d9d7626cd56e0abff

Fatal error: [File:D:/Build/++UE4+Licensee/Sync/Engine/Source/Runtime/Engine/Private/Materials/MaterialShared.cpp] [Line: 1858] Failed to compile default material WorldGridMaterial!

UE4Editor_Engine
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_CoreUObject
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UE4Editor_CoreUObject
UE4Editor_CoreUObject
UE4Editor_CoreUObject
UE4Editor_CoreUObject
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UE4Editor_Engine
UE4Editor_Engine
UE4Editor_CoreUObject
UE4Editor_CoreUObject
UE4Editor_CoreUObject
UE4Editor_Engine
UE4Editor_CoreUObject
UE4Editor_CoreUObject
UE4Editor_CoreUObject
UE4Editor
UE4Editor
UE4Editor
UE4Editor
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kernel32
ntdll