BerriAI/litellm · error · ValueError

api_key is required

Error message

api_key is required

What it means

Error "api_key is required" thrown in BerriAI/litellm.

Source

Thrown at litellm/integrations/arize/arize_phoenix_client.py:42

    Supports:
    - Authentication with Bearer tokens
    - Fetching prompt versions
    - Direct API base URL configuration
    """

    def __init__(self, api_key: str | None = None, api_base: str | None = None):
        """
        Initialize the Arize Phoenix client.

        Args:
            api_key: Arize Phoenix API token
            api_base: Base URL for the Arize Phoenix API (e.g., 'https://app.phoenix.arize.com/s/workspace/v1')
        """
        self.api_key = api_key
        self.api_base = api_base

        if not self.api_key:
            raise ValueError("api_key is required")

        if not self.api_base:
            raise ValueError("api_base is required")

        # Set up authentication headers
        self.headers = {
            "Authorization": f"Bearer {self.api_key}",
            "Accept": "application/json",
        }

        # Initialize HTTPHandler
        self.http_handler = HTTPHandler(disable_default_headers=True)

    def get_prompt_version(self, prompt_version_id: str) -> dict[str, Any] | None:
        """
        Fetch a prompt version from Arize Phoenix.

        Args:

View on GitHub (pinned to 6c2dcb801b)

Solutions

1. Pass api_key to the Arize Phoenix client.

When it happens

Trigger: Thrown at litellm/integrations/arize/arize_phoenix_client.py:42 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of BerriAI/litellm@6c2dcb801b (2026-08-15). Data as JSON: /api/errors/5a54d4a2092ead66. Report an issue: GitHub.