Mine

System.TypeInitializationException: An exception was thrown by the
type initializer for Gecko.WebControl --->
System.DllNotFoundException: libgtkembedmoz.so
in (wrapper managed-to-native) Gecko.WebControl:gtk_moz_embed_get_type ()
in <0x00014> Gecko.WebControl:get_GType ()
in <0x00026> GtkSharp.GeckoSharp.ObjectManager:Initialize ()
in <0x00007> Gecko.WebControl:.cctor ()--- End of inner exception
stack trace ---