If you are getting the following warning
The primary reference "Scandit.BarcodePicker.Unified" could not be resolved because it was built against the ".NETPortable,Version=v5.0" framework. This is a higher version than the currently targeted framework ".NETPortable,Version=v4.5,Profile=Profile78".
It means that .NET Portable Library targeting pack is missing (it is not installed by default with _Mobile development with .NET_ workload in Visual Studio 2019)
This component can be downloaded in two ways:
1) From Microsoft download page: [https://www.microsoft.com/en-us/download/details.aspx?id=40727]
2) From Visual Studio Installer -> Individual components -> .NET Portable Library targeting pack.
The sample needs to be upgraded following these steps: https://xamarinhelp.com/upgrade-pcl-net-standard-class-library/
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