Connect custom model with text generator

Hello,

I added the text generator plugin. I have a mistral model that I got from LM Studio. I deployed it as a server. I want to connect text generator with model.
In the plugin options:

In my note, I write for example: What is AI? I select what I wrote then I click on Generate Text.
In the server logs I get this error:

[2023-11-22 15:45:12.053] [INFO] Received OPTIONS request to /v1/chat/completions with body: {}
[2023-11-22 15:45:12.054] [ERROR] 'messages' field is required.

Make sure the “CORS” is set to on in server settings.