ValueError: empty separator

[ninjakx]

---------------------------------------------------------------------------
ValueError                                Traceback (most recent call last)
<ipython-input-79-5ef70a0f5d68> in <module>()
     24   if len(pos) > 0:
     25     # print(define_labels(pos, sent, labels, bbox, class_value, classification))
---> 26     sent, labels, bbox = define_labels(pos, sent, labels, bbox, class_value, classification)
     27 
     28   # # Define labels for company name

<ipython-input-71-e92669a96825> in define_labels(pos, sent, labels, bbox, class_value, classification, label_other)
     12       # print(sent[i_pos], "==>", str(class_value))
     13 
---> 14       sent[i_pos] = intersperse(sent[i_pos].split(str(class_value)), str(class_value))
     15       # This split leaves a white space element at the initial or final position, so we have to remove it
     16       if sent[i_pos][0].isspace() or len(sent[i_pos][0])==0: sent[i_pos] = sent[i_pos][1:]

ValueError: empty separator