Xamarin - Pressing "add Nuget Packages..." Does Nothing

Trying to add a NuGet package - 'Html Agility Pack' to be specific. But.. Clicking Add NuGet Package doesn't do anything. Nothing happens when you right-click on the project icon a

Solution 1:

Going into Alpha Channels in the updates page then switching to the alpha channel, updating xamarin to 6.1 fixes the bug.