Using history on ChatSession with VertexAI

[arkadyb]

Hi,

I am trying to create a chat session and set a history node value in the request to GenerateContent.

Unfortunately whatever combination of values i would use would come back with the error

```

rpc error: code = InvalidArgument desc = Please ensure that multiturn requests alternate between user and model.

```

The history node value i put is:

```

[{"Role":"user","Parts":["something from the user"]}]

```

Any idea, what am i doing wrong?

Using Go.

[ruthseki]

Hi @arkadyb,

Welcome to Google Cloud Community!

      The error message "rpc error: code = InvalidArgument desc = Please ensure that multiturn requests alternate between user and model" means that your provided history node is not formatted correctly for a multi-turn conversation.

Here's a breakdown of the issue and how to fix it:

The Problem:

The history node should represent a conversation with alternating turns from the user and the model. Your provided history only contains a single turn from the user

[{"Role":"user","Parts":["something from the user"]}]

The Solution:

You need to include both the user's and the model's previous turns in the history node. Each turn should be a separate object in the array, with the Role property set to either "user" or "model":

[
  {"Role": "user", "Parts": ["something from the user in the previous turn"]},
  {"Role": "model", "Parts": ["model's response to the previous turn"]},
  {"Role": "user", "Parts": ["something from the user in the current turn"]} 
]

By following these guidelines, you should be able to correctly format your history node for a multi-turn conversation and eliminate the "InvalidArgument" error.

I hope the above information is helpful.