I've recently upgraded to vs2019 and I get build errors like Can not resolve reference: `System.Web`

If I unload the android project everything builds. The project does not work in VS2017 as well now.
2 weeks ago everything was building fine. I've been investigating this for 2 days and have not had any joy. Any help would be much appreciated
Project is using Android oreo 8.1. I'm new to xamarin development, so I'm hoping I've missed something. Here's the errors I get:

Severity Code Description Project File Line Suppression State Suppression State
Error Can not resolve reference: System.Web, referenced by MobileApp.Shared > SSW.Api.PublicInterface > SSW.Api.Common > EntityFramework > SSW.Cache > Castle.Windsor > Castle.Core. Please add a NuGet package or assembly reference for System.Web, or remove the reference to MobileApp.Shared. MobileApp.Android.SSW

Severity Code Description Project File Line Suppression State Suppression State
Error Can not resolve reference: System.Runtime.Caching, referenced by MobileApp.Shared > SSW.Api.PublicInterface > SSW.Api.Common > EntityFramework > SSW.Cache > Castle.Windsor > Castle.Core. Please add a NuGet package or assembly reference for System.Runtime.Caching, or remove the reference to MobileApp.Shared. MobileApp.Android.CAM

Severity Code Description Project File Line Suppression State Suppression State
Error Can not resolve reference: System.Configuration, referenced by MobileApp.Shared > SSW.Api.PublicInterface > SSW.Api.Common > EntityFramework > SSW.Cache > Castle.Windsor > Castle.Core. Please add a NuGet package or assembly reference for System.Configuration, or remove the reference to MobileApp.Shared. MobileApp.Android.CAM

Severity Code Description Project File Line Suppression State Suppression State
Error "obj\Debug\81\MobileApp.Android.dll;obj\Debug\81\MobileApp.Android.dll" is an invalid value for the "OutputAssembly" parameter of the "Csc" task. Multiple items cannot be passed into a parameter of type "Microsoft.Build.Framework.ITaskItem". MobileApp.Android

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