# `BB.Error.Estimator`
[🔗](https://github.com/beam-bots/bb/blob/main/lib/bb/error/estimator.ex#L5)

State-estimation error classes.

Raised by estimator implementations or by `BB.Estimator.Server` when an
input violates a constraint (too stale, out of sync with the driver
input, missing a covariance that the algorithm requires).

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