not_found

The call references an object that is not on-chain: a weights commit, lease, multisig operation, scheduled call, announcement, or contribution that was never created, was already consumed, or has been removed.

Check the identifier and the current chain state. if the flow has a create step (commit before reveal, announce before execute), make sure it completed on the network you are connected to (check --network).

Remediation

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

Chain errors

The exact chain error names (from the extrinsic receipt) that classify to not_found; the description says what triggered the failure and where to check. Each name has its own page:

Chain error	Description
CallUnavailable	During finalize the crowdloan's stored call could not be fetched from preimage storage, so nothing was dispatched. Check that the preimage referenced by the call field of the Crowdloans entry still exists in the preimage pallet.
CodeInfoNotFound	No CodeInfoOf entry exists for the supplied code hash, so its owner and deposit metadata cannot be read. Verify the code hash argument and that the code was uploaded and not since removed.
CodeNotFound	No uploaded WASM binary exists under the supplied code hash. Verify the code_hash argument used in instantiation, set_code, or a delegate call, and that the code was uploaded via upload_code and not removed.
ColdkeySwapAnnouncementNotFound	coldkey_swap, dispute_coldkey_swap, or clear_coldkey_swap_announcement was called for a coldkey with no pending announcement. Check the ColdkeySwapAnnouncements storage; you must call announce_coldkey_swap first.
ContractNotFound	No contract instance exists at the destination address; the account has no ContractInfoOf entry. Verify the dest address and that the contract was instantiated and has not been terminated.
DeadAccount	The beneficiary account does not exist and this operation is not allowed to create it. Check System.Account for the destination: it must already hold at least the existential deposit before the operation runs.
DelegateDependencyNotFound	unlock_delegate_dependency was called for a code hash that is not among the contract's locked delegate dependencies. Check the code hash argument against the dependencies recorded in the contract's info.
InvalidCrowdloanId	No crowdloan exists in the Crowdloans storage map for the given crowdloan_id; it was never created or has been dissolved. Check Crowdloans for the id and NextCrowdloanId for the range of ids ever issued.
LeaseDoesNotExist	The lease_id argument does not correspond to any stored lease. Query the SubnetLeases storage map to confirm the lease id and whether it was already terminated.
LeaseNetuidNotFound	After registering the leased network, no subnet owned by the lease's derived coldkey could be found, so the netuid lookup failed. Inspect SubnetOwner entries for the lease coldkey; this usually indicates the registration did not complete.
NoContribution	The account has no contribution recorded for this crowdloan, so withdraw has nothing to pay out (or dissolve finds no creator contribution). Check the Contributions double map under the crowdloan_id for the account in question.
NoDeposit	No safe-mode deposit exists for the given account and block combination, so nothing can be released or slashed. Check the Deposits storage map for an entry under that account and deposit block.
NoExistingLock	move_lock was called but no conviction lock exists for the signing coldkey on that subnet. Check the lock storage for the coldkey and netuid, and create a lock before attempting to move it to another hotkey.
NoWeightsCommitFound	A weights reveal was submitted but no pending (non-expired) commit exists for the hotkey and netuid, possibly because it already expired. Query the WeightCommits storage map for the hotkey and check the commit hasn't passed the reveal window.
NoneValue	Template leftover in the drand pallet meaning a storage value was read before ever being set; no current code path raises it. If seen, inspect the drand pallet's storage items for missing initialization.
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.
NotNoted	The preimage cannot be unnoted because no preimage was ever noted for this hash. Check RequestStatusFor (or legacy StatusFor) for the hash to confirm what, if anything, is stored.
NotRequested	The preimage request cannot be removed because there are no outstanding requests for this hash. Check the request status for the hash in RequestStatusFor before calling unrequest_preimage.
NothingAuthorized	No code upgrade has been authorized, so apply_authorized_upgrade has nothing to apply. Check the AuthorizedUpgrade storage item in System; an authorization must be recorded before applying the new code.
SymbolDoesNotExist	The requested token symbol is not in the chain's predefined symbol table, so it cannot be assigned to a subnet. Check the symbol argument against the chain's built-in SYMBOLS list and choose a valid entry.

The same explanation is available in the terminal: btcli explain not_found (or btcli explain <ChainErrorName> for one exact chain error).