# `Ussd.Exceptions.NextStateNotFoundError`
[🔗](https://github.com/spesohq/ussd/blob/main/lib/ussd/exceptions.ex#L21)

Raised when a `Ussd.State` has no `transition`, `back`, `paginate` or `terminate`
clause that matches the caller's input.

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