NotFound

The referenced item does not exist in storage: no multisig operation for that call hash in Multisigs, no scheduled task at that slot or name in Agenda/Lookup, or no matching proxy registration in Proxies. Verify the identifier against current chain state.

Declared by the Multisig, Scheduler, Proxy pallets; it classifies to the semantic code not_found.

Remediation

The referenced object is not on-chain; check the identifier

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