'How to add encode attribute to variables

When I run the code, there is an error of : attributeerror: 'nonetype' object has no attribute 'encode'. How can I assign the encode attribute to the variable?

Codes are as follows: for entry in self._caption_entries:

        tokens = self._tokenizer.encode(entry["caption"])
        tokens = tokens[: self._max_seq_length - 2]
        tokens = self._tokenizer.add_special_tokens_single_sentence(tokens)

I'm still a newcomer to the forum. I don't know how to ask questions correctly. If there's anything wrong, please correct it.

python

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'How to add encode attribute to variables

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