MissingMethodException after upgrading to Monotouch 4.0

Does anyone use the excellent Sparrow 2D monotouch library?

https://github.com/trustme/Sparrow

I just updated to Monotouch 4.0 and Monodevelop 2.4.2, and when rebuilt and run开发者_运维问答 SparrowTest gives me this strange error:

System.MissingMethodException has been thrown "Method not found:
'Monotouch.ObjCRuntime.Messaging.void_objc_msgSend_Boolean'." at
SparrowTest.AppDelegateIPhone.FinishedLaunching in
AppDelegateIPhone.cs:23

The method is:

SPStage.SupportHighResolutions = true;

When commented it gives the same error on many other methods. I've tried using different sdk versions but the problem persists.

Any clues?

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You need to regenerate the sparrow.dll with btouch for MonoTouch 4.

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try to create a script with -out to regenerate Third Part Libraries another way to avoid this problem, is that inm your build output of your project choose : Don't link the assemblies and your project will work

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Problem solved!

With MonoTouch 4.0 we must use smcs instead of gmcs.

Here is the right procedure for generating sparrow.dll with MonoTouch 4.0, in two steps:

/Developer/MonoTouch/usr/bin/btouch sparrow.cs -s:enum.cs --outdir=gen -ns=Sparrow --unsafe --sourceonly=genfiles

/Developer/MonoTouch/usr/bin/smcs -out:sparrow.dll cat genfiles extensions.cs -unsafe -r:/Developer/MonoTouch/usr/lib/mono/2.1/monotouch.dll enum.cs -target:library

Thanks to Geoff Norton and Duane Wandless for the help!