Are the files present on that folder?
During the create method, model maker will use TensorFlow Hub to download the base model (in your case mobilenet_v2) to do transfer learning. Apparently, it thinks the model is there but it can find when loading.
you can also try this code snippet to see if this works fine on your machine:
import tensorflow as tf
import tensorflow_hub as hub
model = hub.load("https://tfhub.dev/google/tf2-preview/mobilenet_v2/feature_vector/4")

this is basically what Model Maker is doing when you get that error.