I got the same error on Windows 8.1 having compiled UE4 using VS2012. It was caused by the shader compiler worker failing to find one of the VS2013 CRT dlls.
Installing the Visual C++ Redistributable Packages for Visual Studio 2013 fixed it for me.
I got the same error on Windows 8.1 having compiled UE4 using VS2012. It was caused by the shader compiler worker failing to find one of the VS2013 CRT dlls.
Installing the Visual C++ Redistributable Packages for Visual Studio 2013 fixed it for me.