The type 'Android.App.Activity' is defined in an assembly that is not referenced...

I'm getting this error upon trying to build the maps demo project. I see Mono.Android in the references section, have removed it rebooted and re-added with no success. I tried repairing mono with no luck...

I do see an update to Xamarin Studio that just won't install. I've tried a bunch of times to get it install...the installer runs for a few seconds then goes away and the update still shows up as available. Not sure if that's related but it might be.

Anybody know what's going on?


  • I should add the full error is the title of the post + "You must add a reference to assembly 'Mono.Android, Version, Culture=neutral, PublicKeyToken=null'.

  • So I was trying to use Xamarin's Google Map demo. I guess it's out dated or something but I went and tried their Google Maps V2 demo using the updated API and Google Play Services and didn't have the same issue there.

    Hope this helps someone in the future.

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