ok so the code i pasted is going query only, it is just searching within the documents i indexed.
but if i want to develop a chat bot that can converse in the manner of james bond, or sherlock holms, or myself, i need to fine-tune it, which requires expensive hardware and human resources over multiple months.
people i am following the llama-index documentation to the word, copy/pasting the code but i am getting this error: TypeError: 'RetrieverQueryEngine' object is not callable how do i fix this error?