Traceback (most recent call last):


 "plug.pyo", line 109, in load_plugins


 "plug.pyo", line 40, in __init__
AttributeError: 'module' object has no attribute 'plugin_start'

Traceback (most recent call last):


 "examples/train_pascal.py", line 24, in <module>

from keras_retinanet.models.resnet import ResNet50RetinaNet


 "build/bdist.linux-x86_64/egg/keras_retinanet/models/resnet.py", line 25, in <module>
AttributeError: 'module' object has no attribute 'custom_objects'
