Errors when running demo.py and video_demo.py

[Khobzer]

I get the following error when I run demo.py even though I built mxnet from source
AttributeError: module 'mxnet.contrib.symbol' has no attribute 'Yolo2Output'

I also get this when I run video_demo.py
resnet50_yolov2_resnet50_416-symbol.json": No such file or directory

I have only downloaded darknet and resnet50 as indicated in the readme

Any ideas ?

[Alexander-flyer]

#34