TypeError: expected Tensor as element 0 in argument 0, but got NoneType

[XiaoyaWang-gh]

When I run the sequencer-test.sh,I got the following error.It seems like the variable outputs is empty.
sequencer-test.sh start Starting test data translation /home/xiaoyawang/miniconda3/envs/py36/lib/python3.6/site-packages/torchtext/legacy/data/field.py:353: UserWarning: To copy construct from a tensor, it is recommended to use sourceTensor.clone().detach() or sourceTensor.clone().detach().requires_grad_(True), rather than torch.tensor(sourceTensor). var = torch.tensor(arr, dtype=self.dtype, device=device) Traceback (most recent call last): File "translate.py", line 35, in <module> main(opt) File "translate.py", line 20, in main attn_debug=opt.attn_debug File "/home/xiaoyawang/sequencer/src/lib/OpenNMT-py/onmt/translate/translator.py", line 210, in translate batch, data, attn_debug, fast=self.fast File "/home/xiaoyawang/sequencer/src/lib/OpenNMT-py/onmt/translate/translator.py", line 354, in translate_batch return self._translate_batch(batch, data) File "/home/xiaoyawang/sequencer/src/lib/OpenNMT-py/onmt/translate/translator.py", line 666, in _translate_batch batch, data_type) File "/home/xiaoyawang/sequencer/src/lib/OpenNMT-py/onmt/translate/translator.py", line 364, in _run_encoder src, src_lengths) File "/home/xiaoyawang/miniconda3/envs/py36/lib/python3.6/site-packages/torch/nn/modules/module.py", line 889, in _call_impl result = self.forward(*input, **kwargs) File "/home/xiaoyawang/sequencer/src/lib/OpenNMT-py/onmt/encoders/rnn_encoder.py", line 55, in forward emb = self.embeddings(src) File "/home/xiaoyawang/miniconda3/envs/py36/lib/python3.6/site-packages/torch/nn/modules/module.py", line 889, in _call_impl result = self.forward(*input, **kwargs) File "/home/xiaoyawang/sequencer/src/lib/OpenNMT-py/onmt/modules/embeddings.py", line 205, in forward source = self.make_embedding(source) File "/home/xiaoyawang/miniconda3/envs/py36/lib/python3.6/site-packages/torch/nn/modules/module.py", line 889, in _call_impl result = self.forward(*input, **kwargs) File "/home/xiaoyawang/miniconda3/envs/py36/lib/python3.6/site-packages/torch/nn/modules/container.py", line 119, in forward input = module(input) File "/home/xiaoyawang/miniconda3/envs/py36/lib/python3.6/site-packages/torch/nn/modules/module.py", line 889, in _call_impl result = self.forward(*input, **kwargs) File "/home/xiaoyawang/sequencer/src/lib/OpenNMT-py/onmt/modules/util_class.py", line 31, in forward return torch.cat(outputs, 2) TypeError: expected Tensor as element 0 in argument 0, but got NoneType sequencer-test.sh done