# InvalidRoundNumber (/docs/errors/chain/InvalidRoundNumber)

A submitted drand pulse has an unacceptable round: the first pulse ever stored must have a round greater than zero, and each later pulse must be exactly `LastStoredRound` plus one. Compare the pulse round against `LastStoredRound`.

Declared by the `Drand` pallet; it classifies to the semantic code [`invalid_argument`](/docs/errors/invalid-argument).

## Remediation [#remediation]

Check the argument values against the operation schema

The same explanation is available in the terminal: `btcli explain InvalidRoundNumber`.