IndexError: list index out of range

[ari9dam]

For some sentences I am getting this error, span_outputs = self._model.span_detector.forward_on_instances(instances) File "/anaconda2/envs/qasrl/lib/python3.6/site-packages/allennlp/models/model.py", line 150, in forward_on_instances model_input = dataset.as_tensor_dict(cuda_device=cuda_device) File "/anaconda2/envs/qasrl/lib/python3.6/site-packages/allennlp/data/dataset.py", line 147, in as_tensor_dict field_classes = self.instances[0].fields IndexError: list index out of range

Is it because Spacy failed to find any `verb'? (https://github.com/allenai/allennlp/issues/996)

Is there any way pass sentence along with POS?

Thank you