Fix BadRequestError

✅ Solution

BadRequestError in litellm often arises from incorrect formatting of the messages array, especially when using tool calls or custom LLM providers. Ensure the `messages` array adheres strictly to the expected format for the specific model, including correct roles (e.g., "system", "user", "assistant", "tool") and content structures for tool use. Validate that `custom_llm_provider` settings are correctly configured for the intended LLM, with no configuration conflicts in place. Double-check your code against the official documentation and example usages to address format and configuration inconsistencies.