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Hi I am migrating my code to newest llama index version and getting an error ValueError: Invalid message type: <class 'langchain.schema.messages.SystemMessage'>

I believe this is due to the query_engine = index.as_query_engine(text_qa_template=CHAT_QA_PROMPT, refine_template=CHAT_REFINE_PROMPT I assume this is outdated code. What would be the newer way of doing this? (see screenshot) thank you! 👍 @Logan M

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10 comments

LLogan M

I think I have an idea of the issue, but can you share the full error/traceback? Just want to confirm

MMaker

Yes, here is the full log. When I remove text_qa_template=CHAT_QA_PROMPT I don't get the error and the code works.

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MMaker

and this is the code

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LLogan M

Ah, this is a bug on our end. You can see the function here does not consider the system prompt type

https://github.com/jerryjliu/llama_index/blob/bbe6cfb899bb78359c6b2f3edc023fb99a042da9/llama_index/llms/langchain_utils.py#L86

I think I know a work around though, will test in about 10 minutes once I'm back at my computer lol

MMaker

oh i see interesting 👀 sure no problem, take your time no rush!

LLogan M

hmm, nah I don't see an easy workaround. BUT I can make a PR. Should get merged pretty quickly, and then you can install from source to get the fix before it hits pypi 🙏

MMaker

okayy thank you!🙏

LLogan M

Update: PR is open https://github.com/jerryjliu/llama_index/pull/6743

LLogan M

PR is merged!

MMaker

oh wow that was fast, thank you! 🙂

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