The Original MADB Project. This is a Managed port of the Android Debug Bridge to allow communication from .NET applications to Android devices. This wraps the same methods that the ddms uses to directly communicate with ADB. This gives more flexibility to the developer than launching an adb process and executing one of its build in commands.
Original Bug on CodePlex
The SyncPackageToDevice / InstallPackage methods will try to copy the package to /sdcard, hence assuming a sdcard is present.
This is not always the case.
Instead, consider copying the app to /data/app/ where you should have access ("works for me"):
https://groups.google.com/forum/#!topic/android-beginners/lc8ILP2uYnc