Amazfit Watch faces

Hi guys,
i have downloaded the amazittools
i can decompile some watchfaces, it puts into a folder , i have the pngs and the json
however each time i try to recompile them im hitting an error , even if i don't touch anything in the files to test

so watchface myface.bin works fine and decompile everything to the myface folder
but when i want to recompile doing this

i receive this error

C:\AMAZBIP>WatchFace.exe myface/myface.json
Processing file 'myface/myface.json'
Reading config...
Reading referenced images from 'myface'
Generating previews...
Writing watch face to 'myface\myface_packed.bin'
System.MissingMethodException: Méthode introuvable : 'Void NLog.Internal.StreamHelpers.Copy(System.IO.Stream, System.IO.Stream)'.
à WatchFace.Parser.Models.Parameter.WriteList(Stream stream, Int32 traceOffset)
à WatchFace.Parser.Models.Parameter.Write(Stream stream, Int32 traceOffset)
à WatchFace.Parser.Writer.Write(IList`1 descriptor)
à WatchFace.Program.WriteWatchFace(String outputDirectory, String outputFileName, String imagesDirectory, WatchFace watchFace)

Not sure why it's in French ...

Help will be much appreciated .

TIA

Nevermind, it works under a windows 7 VM so this was definitely my windows 10 machine ...