can't create a Conversation Search(Build-in RAG) model

I can't create a model. I am following the documentation:

1 -> first step ok: {"message": "A collection with name conversation_store already exists."}%

2 step: {"message": "Gemini API error: "}%

and this is what I use to get the error(changed the API Key of course with the one I recently created in ai studio:

curl 'http://localhost:8108/conversations/models'
-X POST
-H 'Content-Type: application/json'
-H "X-TYPESENSE-API-KEY: xyz"
-d '{
"id": "conv-model-1",
"model_name": "google/gemini-2.0-flash",
"history_collection": "conversation_store",
"api_key": "AIaksdjfadsjbf",
"system_prompt": "You are an assistant for question-answering. You can only make conversations based on the provided context. If a response cannot be formed strictly using the provided context, politely say you do not have knowledge about that topic.",
"max_bytes": 16384
}'

{"message": "Gemini API error: "}%

Start by reproducing the documented Conversation Search model creation request with the provided curl command and compare the successful collection-creation step with the Gemini API error in step 2. Check whether the documented model_name and API key format match the request; done means the model is created without the Gemini error.