Restore NuGet packages
The Visual Studio C# projects included with the Ventura SQL templates have their NuGet packages folder deleted. This was done to keep the Ventura SQL installer small.
The NuGet packages folder contains downloaded NuGet packages, which are mostly referenced assemblies (DLLs).
Visual Studio needs to restore the packages folder by downloading the packages again.
Yellow exclamation triangle
Visual Studio marks the missing references with a yellow exclamation triangle:
Method 1: Rebuild Solution
In Visual Studio go to Build -> Rebuild Solution. Visual Studio may need some time to download and install the packages. The exclamation triangles should disappear:
Should this method not work for some reason, then use Method 2.
Method 2: Force restore in the NuGet Package Manager
In Visual Studio go to "Tools > NuGet Package Manager > Package Management Console"
In the Package Manager Console window then enter the following command:
This will force re-installation of all packages for the opened solution.