Great question — answering as the UphillTech team:
I hope you've found a solution to your problem, but if not, I may have an idea for you. In this article, the author uses ChatOllama instead of OllamaLLM: https://medium.com/@dimosdennis/personal-photo-library-with-langchain-ollama-llava-fully-local-e82edfe07f54 I had a problem similar to the one you describe here and changing it helped me get rid of it! I must admit I haven't gone through all your code, but maybe following the Medium tutorial (for part of it) might help. Good luck ;)
Full answer by Vitally Aberdeen: https://stackoverflow.stackexchange.com/a/79523914 (CC BY-SA 4.0).
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