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Debug Any Error Step by Step

Paste an error and get the root cause, the fix, and how to stop it from happening again — explained step by step.

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I'm getting this error and I need to understand the root cause, not just a quick patch.

Error message:
[PASTE ERROR]

Relevant code:
[PASTE CODE]

What I expected to happen: [EXPECTED BEHAVIOUR]

Please:
1. Explain in plain English what the error means
2. List the 3 most likely causes, ranked by probability, given my code
3. Give me the fix for the most likely cause
4. Tell me how to confirm the fix worked
5. Suggest one change that prevents this class of bug in future

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