Nonce Error

A nonce error is a message from a wallet or network node saying that a transaction cannot be processed because its nonce is wrong. On account-based blockchains such as Ethereum, every transaction from an address carries a counter that starts at zero and must rise by one each time, so transactions are executed in order and cannot be replayed. Errors appear when a transaction reuses a number already confirmed ("nonce too low"), skips ahead and leaves a gap ("nonce too high"), or conflicts with an earlier transaction still waiting in the mempool. Common causes are using one account in two apps at once, a pending transaction with too low a gas fee, or a wallet whose local count is out of date. Fixes usually involve resetting the wallet's activity data, or sending a replacement transaction with the same nonce and a higher fee. Also see MetaMask.