Why does my app submission fail with: Disallowed paths ( iTunesMetadata.plist ) found at ... ?
ERROR: ERROR ITMS-90047: "Disallowed paths ( "iTunesMetadata.plist" ) found at: Payload/iPhoneApp1.app"
This error is the result of a change in Apple's App Store verification process to prevent users from hitting issues like Bug 29180. This specific error is not related to the particular version of Xamarin you have installed, so downgrading will not help.
See the forum discussion here for workaround information and the latest updates for this issue.