Almost Everything from marketplace is giving me this.

!Id:caf302b0f6f057f396388f087432e428

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

Failed to compile default material WorldGridMaterial!

KERNELBASE + 37901 bytes
UE4Editor_Core + 3095292 bytes
UE4Editor_Core + 1661738 bytes
UE4Editor_Engine + 12758528 bytes
UE4Editor_Engine + 12758966 bytes
UE4Editor_Engine + 12234930 bytes
UE4Editor_Engine + 12234306 bytes
UE4Editor_Engine + 12491573 bytes
UE4Editor_CoreUObject + 899050 bytes
UE4Editor_Engine + 12495442 bytes
UE4Editor_Engine + 12489001 bytes
UE4Editor_CoreUObject + 899050 bytes
UE4Editor_CoreUObject + 1329894 bytes
UE4Editor_CoreUObject + 1400728 bytes
UE4Editor_CoreUObject + 1446353 bytes
UE4Editor_CoreUObject + 1505415 bytes
UE4Editor_UnrealEd + 1372918 bytes
UE4Editor_UnrealEd + 1387856 bytes
UE4Editor_UnrealEd + 4590776 bytes
UE4Editor_CoreUObject + 380674 bytes
UE4Editor_CoreUObject + 1514444 bytes
UE4Editor_CoreUObject + 1417170 bytes
UE4Editor!FEngineLoop::PreInit() + 9825 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.4\engine\source\runtime\launch\private\launchengineloop.cpp:1250]
UE4Editor!GuardedMain() + 236 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.4\engine\source\runtime\launch\private\launch.cpp:112]
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]

Now I downloaded and reinstalled twice.

I download the source code and compiled it and tried to run it.

Everything I create works perfect.
But everything from the marketplace gives me similiar if not exactly the same errors.

Hey Evilmincer, can you post this in the Bug Report section of the AnswerHub for us? That will let us assign a developer to the issue. Post a link to your question here also, so that other people can see. Thank you