[Xamarin Android]Can’t export .apk package…

I just tried to export an APK file but when I click "Export Android Package (.apk)" nothing happens, except for a few entries in the outup window:

Building Package Because this call is not awaited, execution of the current method continues before the call is completed.Consider applying the 'await' operator to the result of the call. Because this call is not awaited, execution of the current method continues before the call is completed.Consider applying the 'await' operator to the result of the call. This async method lacks 'await' operators and will run synchronously.Consider using the 'await' operator to await non-blocking API calls, or 'await Task.Run(...)' to do CPU-bound work on a background thread. Because this call is not awaited, execution of the current method continues before the call is completed.Consider applying the 'await' operator to the result of the call. The variable 'aore' is declared but never used No -tsa or -tsacert is provided and this jar is not timestamped. Without a timestamp, users may not be able to validate this jar after the signer certificate's expiration date (2045-07-19) or after any future revocation date. 

I can understand that these few first messages, as they're warnings I forgot to correct but what does the last line mean? Is this the cause of failed build?

by MrReynevan2 via /r/csharp

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