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Visual Studio Nuget Package Restore Error - The type or namespace name 'Xamarin' could not be found

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Good evening,

Recently, I encountered an error called "The type or namespace name 'Xamarin' could not be found (are you missing a using directive or an assembly reference?)" when running my simple Xamarin Forms application in Visual Studio 2019 which is the output of the training I attended with. It seems that the project is missing some references and when running the solution, the project was unable to download the missing assemblies. After investigating the problem, I found the culprit. Our custom Nuget packages were located in a server which has been turned off due to system upgrades and these files will be moved to a new location. So to fix the issue I had to perform the steps below:
1. Temporarily unchecked our custom built packages in Package Sources of Package Manager Settings since our server that contains those packages was turned off for system maintenance and the projects including the packages will be moved to a new location.
The type or namespace name 'Xamarin' could not be found (are you missing a using directive or an assembly reference?)

2. Run the command "Update-Package –reinstall" in Nuget Package Manager Console to restore all packages for the current Xamarin Project or I could have rebuild the solution to restore the missing packages.

Cheers!

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