Pillar A

Error Explainers

8 tested fixes for real error messages. Each explainer includes exact error output, root cause, and a verified solution.

docker

docker

Fix: Error response from daemon: Conflict. The container name is already in use

Fix Docker's 'container name already in use' conflict by removing stale containers or using replace strategies.

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git

git

Fix: fatal: refusing to merge unrelated histories

Fix Git's 'refusing to merge unrelated histories' error when pulling, merging, or connecting a local repo to a remote.

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javascript

javascript

Fix: Access to fetch blocked by CORS policy: No 'Access-Control-Allow-Origin' header

Fix CORS 'No Access-Control-Allow-Origin' errors in Chrome with server-side headers, Express middleware, and proxy patterns.

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python

python

Fix: anthropic.APIStatusError: 529 Overloaded — Anthropic API

Fix Anthropic's 529 Overloaded error with exponential backoff, queue depth monitoring, and fallback model strategies.

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python

Fix: langchain.schema.OutputParserException — Failed to Parse LLM Output

Fix LangChain OutputParserException with robust retry parsers, Pydantic output schemas, and structured output API modes.

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python

Fix: ModuleNotFoundError: No module named 'cv2'

Fix Python's ModuleNotFoundError for cv2 by installing the correct opencv package and resolving virtual environment conflicts.

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python

Fix: openai.RateLimitError: You exceeded your current quota

Fix OpenAI rate limit and quota errors with practical retry, batching, and model fallback patterns.

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typescript

typescript

Fix: TS2322: Type 'string' is not assignable to type

Fix TypeScript TS2322 type assignment errors with const assertions, type guards, proper generics, and union narrowing.

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