Fix AssertionError

✅ Solution

AssertionErrors in Arize Phoenix Anthropic streaming usually stem from unhandled event types within the `ParsedMessage` structure, specifically `ParsedMessageStopEvent` or `ParsedContentBlockStopEvent`. To resolve this, ensure your code includes explicit handling for these stop events, likely by adding new cases to your event-processing logic that gracefully exits or modifies the data stream. This might involve updating a switch statement or adding new conditional branches to properly manage these specific stop conditions.