Is this in the simulator or on the device (I’m guessing simulator)? For iOS, the native components will be statically linked into the actual managed DLL since iOS only supports dynamic libraries from iOS 8. You don’t need to build the native package yourself (that is what the nuget package is for, but it seems there are some growing pains). Here are some things to check:
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Is the package installed on the project that is being deployed to the device (and not an intermediate DLL project?)
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In the output directory, what is the file size of cbforest-sharp.dll. If it is 38k then the wrong file is being copied somehow. Try doing a clean build.
Let me know about these things.