Unable to build mobile MonoGame project because of a "could not import" error

I am making a mobile MonoGame application for the first time but whenever I try and build this error occurs for iOS

Error: /Users/edward/Library/Mobile Documents/com~apple~CloudDocs/apps/Xamarin/Android/Radiant/iOS/Radiant.iOS.csproj: /Users/edward/Library/Mobile Documents/com~apple~CloudDocs/apps/Xamarin/Android/Radiant/iOS/Radiant.iOS.csproj could not import "$(MSBuildExtensionsPath)MonoGamev3.0MonoGame.Content.Builder.targets" (Radiant.iOS)

and this error occurs for Android

Error: /Users/edward/Library/Mobile Documents/com~apple~CloudDocs/apps/Xamarin/Android/Radiant/Android/Radiant.Droid.csproj: /Users/edward/Library/Mobile Documents/com~apple~CloudDocs/apps/Xamarin/Android/Radiant/Android/Radiant.Droid.csproj could not import "$(MSBuildExtensionsPath)MonoGamev3.0MonoGame.Content.Builder.targets" (Radiant.Droid)

On the left in the references column, MonoGame.Framework is greyed out and there is a red X next to it