When I try to build the app in xamarin I see this error "The specified executable is not a valid application for this OS platform "

ERROR:

Severity Code Description Project File Line Suppression State Error Unhandled exception: System.ComponentModel.Win32Exception (0x80004005): The specified executable is not a valid application for this OS platform. at System.Diagnostics.Process.StartWithCreateProcess(ProcessStartInfo startInfo) at System.Diagnostics.Process.Start() at Xamarin.Android.Tasks.CompileNativeAssembly.RunAssembler(Config config) at Xamarin.Android.Tasks.CompileNativeAssembly.b__21_0(Config config) at Xamarin.Android.Tasks.AsyncTaskExtensions.<>c__DisplayClass0_0`1.b__0(TSource s) App1.Android