Great question — answering as the UphillTech team:
I've encountered the same problem. Actually, at least in my case, it happens because of RAM (I think so). I have only 8 GB. However, I am able to run llama-2-7b using some kind of a workaround, namely, running this model directly from the llama folder.
Full answer by forvev: https://stackoverflow.stackexchange.com/a/77737641 (CC BY-SA 4.0).
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