While running the following code snippet, I get the following error 'list' object has no attribute 'split'
for i in range(len(questions1)):
    # Question strings need to be separated into words
    # Each question needs a unique label
            questions_labeled.append(TaggedDocument(questions1[i].split(), df[df.index == i].qid1))
            questions_labeled.append(LabeledSentence(questions2[i].split(), df[df.index == i].qid2))
            if i % 10000 == 0:
                progress = i/len(questions1) * 100
                print("{}% complete".format(round(progress, 2)))```
 
     
    