# `Prometheus.MFAlreadyExistsError`
[🔗](https://github.com/prometheus-erl/prometheus.ex/blob/v5.1.0/lib/prometheus/error.ex#L81)

Raised when one tries to create metric in `registry` with `name` it already exists.

# `message`

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*Consult [api-reference.md](api-reference.md) for complete listing*