runtime error

Traceback (most recent call last): File "/home/user/app/main.py", line 17, in <module> service_context = ServiceContext.from_defaults( File "/home/user/.local/lib/python3.10/site-packages/llama_index/indices/service_context.py", line 147, in from_defaults node_parser = node_parser or _get_default_node_parser( File "/home/user/.local/lib/python3.10/site-packages/llama_index/indices/service_context.py", line 27, in _get_default_node_parser return SimpleNodeParser.from_defaults( File "/home/user/.local/lib/python3.10/site-packages/llama_index/node_parser/simple.py", line 55, in from_defaults text_splitter = get_default_text_splitter( File "/home/user/.local/lib/python3.10/site-packages/llama_index/text_splitter/__init__.py", line 22, in get_default_text_splitter return SentenceSplitter( File "/home/user/.local/lib/python3.10/site-packages/llama_index/text_splitter/sentence_splitter.py", line 54, in __init__ chunking_tokenizer_fn = chunking_tokenizer_fn or split_by_sentence_tokenizer() File "/home/user/.local/lib/python3.10/site-packages/llama_index/text_splitter/utils.py", line 34, in split_by_sentence_tokenizer import nltk ModuleNotFoundError: No module named 'nltk'

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