MIDIBus on 64-bit OSX 10.11.3: Errors

I am currently trying to run one of the example codes for MIDIBus on a 64-bit OS X machine, and I run across this error:

"A library relies on native code that's not available. Or only works properly when the sketch is run as a 32-bit application."

The error rises specifically from this line:::

MidiBus.list();

Does anyone know how to resolve the situation? Or pointers on some other MIDI libraries that have been known to work on a 64-bit environment if that is the problem?

Thanks in advance!