Xamarin build error Exception while loading assemblies: System.IO.FileNotFoundException

Question

always i try to Build my Xamarin app i get this error. And i dont know why. I use the System.Security.dll of .Net Framework 4 and i though this should work. Thanks.

Answer 1

I had the same issue with System.Web. All I had to do was to add the System.Web reference from the GAC.

update

GAC is probably the wrong word here. Those are the default .net (mono) framework libraries. You can find them in Project/References/ and right click to 'Edit References' you'd find the framework libraries under Packages tab.

Answer 2

Add the missing .dll to your project(s).

Right click on the References folder -> Add Reference -> Browse -> C:\Windows\Microsoft.NET\Framework64\<version number>\ -> <missing.dll>

Clean your project and rebuild