BTOUCH error Bl1001 - do not know how to make a trapoline - ios

I am trying to create an iOS binding library to wrap Kxmovie. I followed all the instructions in the Xamarin bindings library walkthrough and got as far as trying to build the library. However, it fails with the following error;
Error BI1001: bgen: Do not know how to make a trampoline for IKVM.Reflection.Reader.ParameterInfoImpl (BI1001) (KxmovieBinding)
Does anyone know what this means or how to fix it?

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