issue running buildMREUnityRuntimeDLL.bat

[younitee]

C:\Users{myusername}\workspace\mixed-reality-extension-unity>msbuild buildMREUnityRuntimeDLL.bat
Microsoft (R) Build Engine version 16.7.0+b89cb5fde for .NET Framework
Copyright (C) Microsoft Corporation. All rights reserved.

Build started 9/3/2020 1:18:15 PM.
Project "C:\Users{myusername}\workspace\mixed-reality-extension-unity\buildMREUnityRuntimeDLL.bat" on node 1 (default targets).
C:\Users{myusername}\workspace\mixed-reality-extension-unity\buildMREUnityRuntimeDLL.bat(1,1): error MSB4025: The project file could not be loaded. Data at the root level is invalid. Line 1, position 1.
Done Building Project "C:\Users{myusername}\workspace\mixed-reality-extension-unity\buildMREUnityRuntimeDLL.bat" (default targets) -- FAILED.

Build FAILED.

"C:\Users{myusername}\workspace\mixed-reality-extension-unity\buildMREUnityRuntimeDLL.bat" (default target) (1) ->
C:\Users{myusername}\workspace\mixed-reality-extension-unity\buildMREUnityRuntimeDLL.bat(1,1): error MSB4025: The projectfile could not be loaded. Data at the root level is invalid. Line 1, position 1.

0 Warning(s)
1 Error(s)

Time Elapsed 00:00:00.14

[younitee]

I put 2019 Visual Studio MSBuild in my path but still get the following error:
MSBuild not found - please install Visual Studio 2017 or later Press any key to continue . . .

[SoundGuy]

I'm getting the same error MSBuild not found. where do i add it to find it?