Cosine similarity error: index 1 is out of bounds for axis 1 with size 1

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Python

I'm currently trying to extract cosine similarity values to compare two different texts, using TF-IDF values. This is the code I'm using:

def cosine_sim(text1, text2):
    tfidf = vectorizer.fit_transform(text1, text2)
    return ((tfidf * tfidf.T).A)[0,1]

negitsimilarity = []
    for c,p in zip(cnegitlist,panegitlist):
       cosinesimnegit = cosine_sim(c,p)
       negitsimilarity.append(cosinesimnegit)

However, whenever I run this code, I keep getting this error:

IndexError: index 1 is out of bounds for axis 1 with size 1

This function worked for my other dataset, so I'm not sure why it didn't work for this one. I've tried looking through the array sizes for the TF-IDF values, but haven't been able to find anything unusual. Does anyone have any advice?

What I have tried:

- Since this was an index error, I've tried looking through the array sizes for the TF-IDF values, but haven't been able to find anything unusual.
- As stated before, I've also tried using it with other datasets, and it worked. I'm not sure what is different about this dataset.