It generally means the app running on the device crashed for some reason, so it breaks the socket the debugger was using to talk to the app.

Generally, there will be a stack trace in the device logcat. It probably won't be pulled automatically into the IDE because the connection was lost, so you may need to one of the other ways to view logcat:

http://docs.xamarin.com/android/advanced_topics/android_debug_log

Jonathan

On 5/16/2012 10:27 AM, Stuart Lodge wrote:
I've tried to repro this...

Have only managed to repro it once in 20 minutes and that was with a
complete phone hang.

So not sure at present - will try again tomorrow!

Stuart

On 16 May 2012 16:14, Stuart Lodge <[email protected]
<mailto:[email protected]>> wrote:

    This dialog came up while an app was running in the debugger in 4.2
    from VS2010 - nothing obvious went wrong in the app.

    http://i.imgur.com/x2zCb.png

    recent debug output window looked like:

    05-16 15:10:18.190 D/dalvikvm(16310): GC_EXTERNAL_ALLOC freed 103K,
    47% free 2972K/5511K, external 1186K/1281K, paused 38ms
    05-16 15:10:18.245 D/dalvikvm(16310): GC_EXTERNAL_ALLOC freed 6K,
    47% free 2967K/5511K, external 2533K/2829K, paused 37ms
    Mono.Debugger.Soft.VMDisconnectedException: Exception of type
    'Mono.Debugger.Soft.VMDisconnectedException' was thrown.
        at Mono.Debugger.Soft.Connection.SendReceive(CommandSet
    command_set, Int32 command, PacketWriter packet)
        at Mono.Debugger.Soft.Connection.Object_GetInfo(Int64 id)
        at Mono.Debugger.Soft.VirtualMachine.GetObject[T](Int64 id,
    Int64 domain_id, Int64 type_id)
        at Mono.Debugger.Soft.VirtualMachine.GetObject[T](Int64 id)
        at Mono.Debugger.Soft.Event.get_Thread()
        at Mono.Debugging.Soft.SoftDebuggerSession.HandleEvent(Event e)
        at
    Mono.Debugging.Soft.SoftDebuggerSession.HandleEventSet(EventSet es)
        at Mono.Debugging.Soft.SoftDebuggerSession.EventHandler()
    The program 'Mono' has exited with code 255 (0xff).





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