How to test API changes?

I've followed the [guide](https://github.com/dotnet/wpf/blob/master/Documentation/developer-guide.md#testing-api-changes) and added the lines to my csproj file. I've changed the Wpfrootpath and fixed the Reference paths.

```


C:\Users\abc\source\repos\wpf

Debug

true

win-x86





```

My API changes are recognized by VS. However I cannot build as I get the following errors:

`Assembly XX with identity XY uses ZZ which has a higher version than referenced assembly ....`

```
Error CS1705 Assembly 'PresentationFramework' with identity 'PresentationFramework, Version=42.42.42.42, Culture=neutral, PublicKeyToken=31bf3856ad364e35' uses 'System.Runtime, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' which has a higher version than referenced assembly 'System.Runtime' with identity 'System.Runtime, Version=5.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'
Error CS1705 Assembly 'PresentationCore' with identity 'PresentationCore, Version=42.42.42.42, Culture=neutral, PublicKeyToken=31bf3856ad364e35' uses 'System.Runtime, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' which has a higher version than referenced assembly 'System.Runtime' with identity 'System.Runtime, Version=5.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'
Error CS1705 Assembly 'WindowsBase' with identity 'WindowsBase, Version=42.42.42.42, Culture=neutral, PublicKeyToken=31bf3856ad364e35' uses 'System.Runtime, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' which has a higher version than referenced assembly 'System.Runtime' with identity 'System.Runtime, Version=5.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'
Error CS1705 Assembly 'PresentationFramework' with identity 'PresentationFramework, Version=42.42.42.42, Culture=neutral, PublicKeyToken=31bf3856ad364e35' uses 'System.Runtime, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' which has a higher version than referenced assembly 'System.Runtime' with identity 'System.Runtime, Version=5.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'
Error CS1705 Assembly 'PresentationFramework' with identity 'PresentationFramework, Version=42.42.42.42, Culture=neutral, PublicKeyToken=31bf3856ad364e35' uses 'System.Runtime, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' which has a higher version than referenced assembly 'System.Runtime' with identity 'System.Runtime, Version=5.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'
Error CS1705 Assembly 'PresentationCore' with identity 'PresentationCore, Version=42.42.42.42, Culture=neutral, PublicKeyToken=31bf3856ad364e35' uses 'System.Runtime, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' which has a higher version than referenced assembly 'System.Runtime' with identity 'System.Runtime, Version=5.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'
Error CS1705 Assembly 'WindowsBase' with identity 'WindowsBase, Version=42.42.42.42, Culture=neutral, PublicKeyToken=31bf3856ad364e35' uses 'System.Runtime, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' which has a higher version than referenced assembly 'System.Runtime' with identity 'System.Runtime, Version=5.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'
Error CS1705 Assembly 'PresentationFramework' with identity 'PresentationFramework, Version=42.42.42.42, Culture=neutral, PublicKeyToken=31bf3856ad364e35' uses 'System.Runtime, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' which has a higher version than referenced assembly 'System.Runtime' with identity 'System.Runtime, Version=5.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'
Error CS1705 Assembly 'PresentationFramework' with identity 'PresentationFramework, Version=42.42.42.42, Culture=neutral, PublicKeyToken=31bf3856ad364e35' uses 'System.Runtime, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' which has a higher version than referenced assembly 'System.Runtime' with identity 'System.Runtime, Version=5.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'
Error CS1705 Assembly 'PresentationCore' with identity 'PresentationCore, Version=42.42.42.42, Culture=neutral, PublicKeyToken=31bf3856ad364e35' uses 'System.Runtime, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' which has a higher version than referenced assembly 'System.Runtime' with identity 'System.Runtime, Version=5.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'
Error CS1705 Assembly 'WindowsBase' with identity 'WindowsBase, Version=42.42.42.42, Culture=neutral, PublicKeyToken=31bf3856ad364e35' uses 'System.Runtime, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' which has a higher version than referenced assembly 'System.Runtime' with identity 'System.Runtime, Version=5.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'

```