Explain this error like a senior

Prompt body

I hit an error while vibe-coding with an AI agent.

Explain:
1. What the error means (1–2 sentences)
2. Most likely root cause given my stack
3. The smallest fix (exact steps)
4. How to confirm it's fixed
5. What NOT to do (common wrong rabbit holes)

Stack: {{stack}}
Error + traceback:
{{paste}}
Relevant snippet:
{{paste}}