No valid iPhone code signing keys found in keychain error Xamarin even after deleted Entitlements.plist

Yeah it seems bug in Xamarin Studio It has work around that you must have AppleID just to login on XCode. Try following:

• Create an Acount @ Apple Dev (If you don't have)
• Open XCode and Menu
• Preferences > Accounts > Add AppleID (Just Created)

_{(source: apple.com)}

• Now go back to Xamarin Studio and try to build your application again on simulator.

Try to rebuild and issues gone!!

In my case, there was already apple id but I clicked on ManageCertificate

and then I added certificate by clicking on plus sign and its done.

Try to delete Entitlements.plist from iOS project and try to recompile project.