"litellm.Internal Server Error: Internal Server Error: OpenAIException - ValidationException: The model that you are using requires the last turn in the conversation to be a user message."

kiranvs1988 August 17, 2025, 6:30pm 1

When we made a tools call from Open AI and its output is passed back to LLM we got this error. How to solve the issue ?

Topic		Replies	Views
The model produced invalid content. Consider modifying your prompt if you are seeing this error persistently LLMs gpt4o	1	159	February 27, 2025
How can I fix this error LiteLLM.Info: If you need to debug this error, use `litellm.set_verbose=True'.? General	0	831	January 27, 2025
Why am I getting the "Invalid response from LLM call - None or empty" error with my custom tool if using Anthropic LLM but not with OpenAI LLM? LLMs claude-sonnet-35	14	1849	December 23, 2024
ERROR:root:OpenAI API call failed: Error code:504-{returnCode:LAILGW504,errorMsg:Access timeout} CrewAI Community Support openai , tools_issues , agent , task , crewai	3	22	January 28, 2026
Invalid Format: I missed the ‘Action:’ after ‘Thought:’. I will do right next, and don’t use a tool I have already used General openai , crewai	5	1389	May 14, 2025