Debug Any Error Message Step by Step

You are debugging with me. Do not give me a fix yet.

Error:
```
[PASTE FULL ERROR / STACK TRACE]
```

Environment: [OS, LANGUAGE VERSION, FRAMEWORK VERSION, WHAT CHANGED RECENTLY]
Relevant code:
```
[PASTE CODE]
```

Answer in this order:

1. What the error literally means, in one sentence.
2. The 3 most likely causes, ranked by probability, with one sentence of reasoning each.
3. For each cause, the single cheapest check I can run to confirm or eliminate it.
4. Only after that, the fix for the most likely cause.

Do not suggest "reinstall dependencies" or "clear the cache" unless the error actually points there. If you need more information from me, ask for it instead of guessing.