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E1205 — Operation forbidden

PropertyValue
Code1205
SlugE1205
Categoryruntime (Runtime)

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What happened

Operation forbidden.

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Why it happened

The operation is disallowed in this context. Common triggers: synchronous call depth exceeding 32, reentrant call detected, or side-effect in a @pure handler.

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How to fix

Restructure the call graph — flatten the call chain, use asynchronous messages instead of deep sync calls, or move side-effects out of @pure handlers.

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Receipt example

{
  "code": 1205,
  "slug": "E1205",
  "category": "runtime",
  "what": "Operation forbidden",
  "fix": "Restructure the call graph — flatten the call chain, use asynchronous messages instead of deep sync calls, or move side-effects out of `@pure` handlers.",
  "docs_url": "https://docs.cowboy.inc/errors/E1205"
}

All Error Codes

View the complete error code reference