It is very complicated and it is hard to reproduce the problem without your solution.
Possible reason could be in the following:
- some of the required DLLs are not referenced or some DLL has incorrect version
- required DLLs were built for different SL version than the one used in the project
Usually the RadMap application required references for the three following DLLs:
Please check that all of these DLLs are referenced in your project. Also make sure the Silverlight version of your project conforms with the referenced DLLs.
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