Expected the last role to be user but received a different role. Ensure proper role assignment in your configuration.

The error you are encountering with the Mistral AI API, specifically the message "Expected last role User or Tool (or Assistant with prefix True) for serving but got RoleEnum.system," indicates a problem with the role configuration in your API request.

Here is a concise explanation of the issue:

• The Mistral API expects the last role in the conversation to be either "User" or "Tool" (or "Assistant" with a specific prefix), but your request is ending with a role that is not compliant with these expectations, specifically "RoleEnum.system".

• This mismatch in role configuration causes the API to interpret the request as invalid, leading to a "Bad Request" error with a status code of 400.