Temporary Fix!!
It seems the program that generates the XML has not been added to the actual UE4 build. Here is the fix
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Go to \Engine\Source\Programs\EnvVarsToXML open the SLN and build it
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that will make a directory in \Engine\Source\Binaries\DotNET copy all 6 files in there
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Paste all files to \Engine\Binaries\DotNET
This will fix the errors
P.s you can probably get away with not including the 3 vhost files, just the first 3