UnboundLocalError: local variable 'd_e1' referenced before assignment

[SeekPoint]

mldl@ub1604:~/ub16_prj/relation2vec$ PYTHONPATH=./ python3 relation_cnn_classification/relation_cnn_attention.py
"The system as described above has its greatest application in an arrayed configuration of antenna elements."

Traceback (most recent call last):
File "relation_cnn_classification/relation_cnn_attention.py", line 6, in
import dependency_load_data
File "/home/mldl/ub16_prj/relation2vec/dependency_load_data.py", line 146, in
MAX_DOCUMENT_LENGTH = max(get_Max_length(SemEval_train_data()),get_Max_length(SemEval_test_data()))
File "/home/mldl/ub16_prj/relation2vec/dependency_load_data.py", line 111, in SemEval_train_data
s,e1,e2=Parse_Sentence(sen)
File "/home/mldl/ub16_prj/relation2vec/dependency_load_data.py", line 58, in Parse_Sentence
return path,d_e1,d_e2
UnboundLocalError: local variable 'd_e1' referenced before assignment
mldl@ub1604:~/ub16_prj/relation2vec$