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Debug the cause, not just the symptom

7 min 1000 XP

1Pick a challengeOpen the left rail or choose a tool.

2ReproduceRun the supplied command and read the first useful line.

3InvestigateTry diagnostics, edit code, or ask Gemini for a hypothesis.

4Fix and verifyApply the smallest change, then rerun the original command.

devfixes / javascript / js-undefined

profile.jsjavascriptCtrl + Enter to reproduce

JavaScript runtime

DevFixes runtime ready

Loaded: Cannot read properties of undefined

Reproduce the failure, inspect evidence, then fix it.

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