OPENAI API call - Invalid type for 'messages': expected an array of objects, but got a string instead.

Hi everyone,

I am having an issue while experimenting with OPENAI API calls.

I have a JSON page parameter that I populate dynamically via a custom code launched from a button.

Then, I use its content for the API call but I get the following error.

{error: {message: Invalid type for 'messages': expected an array of objects, but got a string instead., type: invalid_request_error, param: messages, code: invalid_type}}

For some reason, the JSON variable is taken as String even though I defined it as JSON type page parameter levels.

Any suggestion of what I might be doing wrong?

Many thanks in advance.