Update to preview 4 produced an error

This code worked beautifully in preview 1, but in preview 2 I had these errors:

Error 2 error CS0101: namespace ‘’ already contains a definition for ‘WebBrowser’ c:\Program Files\Unreal Engine\4.7\Engine\Source\Runtime\WebBrowser\WebBrowser.Build.cs 5 14 librythianChronicles

and

Error 1 error CS0101: namespace ‘’ already contains a definition for ‘CEF3Utils’ c:\Program Files\Unreal Engine\4.7\Engine\Source\Runtime\CEF3Utils\CEF3Utils.Build.cs 5 14 librythianChronicles

I did not create either file. Any and all help is much appreciated!!

Duplicate of Update to 4.7 preview 4 renders error - C++ - Epic Developer Community Forums