when use the ZF model, not the VGG16. The error happens

[315386775]

I have used the code to train my own model. But there is a error about log.
when you train your own model, the final output is: (Wrote snapshot to:xxx).
But the py-faster-rcnn the output is : done solving.
The difference result to the error in test phase.
The code:

• ./tools/test_net.py --gpu --gpu 0,1,2,3 --def models/pascal_voc/VGG16/faster_rcnn_end2end/test.prototxt --net --imdb voc_2007_test --cfg experiments/cfgs/faster_rcnn_end2end.yml
  imagenet_train
  <function at 0x7f69d313e2a8>
  imagenet_val
  <function at 0x7f69d313e320>
  usage: test_net.py [-h] [--gpu GPU_ID] [--def PROTOTXT] [--net CAFFEMODEL]
  [--cfg CFG_FILE] [--wait WAIT] [--imdb IMDB_NAME] [--comp]
  [--set ...] [--vis] [--num_dets MAX_PER_IMAGE]
  [--rpn_file RPN_FILE]
  test_net.py: error: argument --gpu: expected one argument

You can see in the : --net , expected one argument.
Can anyone solve it?