UI Test is not working while running the test result

I have created a UI Test project and added the Android and iOS project to the UITest I am getting error message "Error NU1201 Project NXRoomSetup.Android is not compatible with net461 (.NETFramework,Version=v4.6.1). Project NXRoomSetup.Android supports: monoandroid90 (MonoAndroid,Version=v9.0)"