Traceback (most recent call last):


 "/usr/lib/python2.7/dist-packages/youtube_dl/YoutubeDL.py", line 666, in extract_info

ie_result = ie.extract(url)


 "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/common.py", line 316, in extract

return self._real_extract(url)


 "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 1407, in _real_extract

encrypted_sig, video_id, player_url, age_gate)


 "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 915, in _decrypt_signature

'Signature extraction failed: ' + tb, cause=e)
ExtractorError: Signature extraction failed: Traceback (most recent call last):

Traceback (most recent call last):


 "train.py", line 520, in <module>

train()


 "train.py", line 309, in train

losses = net(datum)


 "C:\Users\skugler\AppData\Local\Continuum\anaconda3\envs\env_yolact\lib\site-packages\torch\nn\modules\module.py", line 547, in __call__

result = self.forward(*input, **kwargs)


 "C:\Users\skugler\AppData\Local\Continuum\anaconda3\envs\env_yolact\lib\site-packages\torch\nn\parallel\data_parallel.py", line 150, in forward

return self.module(*inputs[0], **kwargs[0])


 "C:\Users\skugler\AppData\Local\Continuum\anaconda3\envs\env_yolact\lib\site-packages\torch\nn\modules\module.py", line 547, in __call__

result = self.forward(*input, **kwargs)


 "train.py", line 145, in forward

losses = self.criterion(self.net, preds, targets, masks, num_crowds)


 "C:\Users\skugler\AppData\Local\Continuum\anaconda3\envs\env_yolact\lib\site-packages\torch\nn\modules\module.py", line 547, in __call__

result = self.forward(*input, **kwargs)


 "C:\Users\skugler\Desktop\Sabine_master\yolact\layers\modules\multibox_loss.py", line 159, in forward

ret = self.lincomb_mask_loss(pos, idx_t, loc_data, mask_data, priors, proto_data, masks, gt_box_t, score_data, inst_data, labels)


 "C:\Users\skugler\Desktop\Sabine_master\yolact\layers\modules\multibox_loss.py", line 662, in lincomb_mask_loss

maskiou_t = torch.cat(maskiou_t_list)
RuntimeError: expected a non-empty list of Tensors