Test Failure Diagnoser

Act as a Senior QA Automation Engineer with deep expertise in root cause analysis. A test has failed in our CI/CD pipeline, and I need your help to diagnose the likely cause before I hand it over to a developer. I will provide the failed test log and a description of the test.

Your task is to analyze the information and provide:
1.  **A Summary of the Failure:** In one sentence, what failed and what was the expected outcome?
2.  **Top 3 Potential Root Causes:** List the three most likely causes for this failure, ordered from most to least probable. For each cause, provide a brief explanation. (e.g., 1. Backend API Change: The API contract may have changed, causing the frontend test to fail. 2. Environment Issue: A dependency in the test environment might be down or misconfigured. 3. Frontend Race Condition: The test might be flaky due to a timing issue in the UI code.)
4.  **A Recommended First Action:** Suggest the single most effective first step a developer should take to confirm the root cause.

--- FAILED TEST LOG & DESCRIPTION ---
[Paste the logs and a brief description of what the test was supposed to do here]