# `Ussd.Exceptions.InvalidStateError`
[🔗](https://github.com/spesohq/ussd/blob/main/lib/ussd/exceptions.ex#L32)

Raised when an `Ussd.Action` chain resolves to a module that isn't a `Ussd.State`.

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