Could not load assembly 'Xamarin.Android.Support.Fragment...'

I am getting this error in VS 2017 when attempting to build my Android project.

Exception while loading assemblies: System.IO.FileNotFoundException: Could not load assembly 'Xamarin.Android.Support.Fragment, Version=1.0.0.0, Culture=neutral, PublicKeyToken='. Perhaps it doesn't exist in the Mono for Android profile?
'Xamarin.Android.Support.Fragment.dll'
   at Java.Interop.Tools.Cecil.DirectoryAssemblyResolver.Resolve(AssemblyNameReference reference, ReaderParameters parameters)
   at Xamarin.Android.Tasks.ResolveAssemblies.AddAssemblyReferences(DirectoryAssemblyResolver resolver, ICollection`1 assemblies, AssemblyDefinition assembly, Boolean topLevel)
   at Xamarin.Android.Tasks.ResolveAssemblies.Execute(DirectoryAssemblyResolver resolver)

I uninstalled and reinstalled the Xamarin.Forms nuget package from my Android project, but that didn't help. I also deleted the content in C:/users/me/AppData/Local/Xamarin/zips, but that also didn't help.

I would appreciate any help, I'm not sure how to solve this issue