I have an application running on iOS where I pickle a numpy array in order to save it for later use. However, I receive the following error: pickle.dumps(arr) ... _pickle.PicklingError: Can't pickle <built-in function _reconstruct>: import of module 'multiarray' failed On a desktop system (OSX), there is no problem dumping the array. I am using NumPy v1.9.3 Any ideas on why this might be happening? Thank you, David