build Warble in cmd or visual studio

Hi, When i try to build the environment for Python SDK by building Warble I get this error in Command Prompt (as admin):
https://github.com/mbientlab/Warble

Microsoft Windows [Version 10.0.17134.228]
(c) 2018 Microsoft Corporation. All rights reserved.

C:\WINDOWS\system32>MSBuild.exe warble.sln
Microsoft (R) Build Engine version 15.8.168+ga8fba1ebd7 for .NET Framework
Copyright (C) Microsoft Corporation. All rights reserved.

MSBUILD : error MSB1009: Project file does not exist.
Switch: warble.sln

C:\WINDOWS\system32>

I get similar errors when I try to build the solution in Visual Studio 2017:
1>------ Rebuild All started: Project: warble, Configuration: Debug x64 ------
1>Object reference not set to an instance of an object.
2>------ Rebuild All started: Project: example-scanner, Configuration: Debug x64 ------
2>Object reference not set to an instance of an object.
2>Error: Object reference not set to an instance of an object.
3>------ Rebuild All started: Project: example-connect, Configuration: Debug x64 ------
3>Object reference not set to an instance of an object.
3>Error: Object reference not set to an instance of an object.
4>------ Rebuild All started: Project: example-read-dev-info, Configuration: Debug x64 ------
4>Object reference not set to an instance of an object.
4>Error: Object reference not set to an instance of an object.
========== Rebuild All: 0 succeeded, 4 failed, 0 skipped ==========

I have installed Python 3.7, FCU Windows 10 SDK (10.0.16299.0) and pip also.

What am I doing wrong? Thank you.

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