error-codes.md

Contract Error Codes

This reference documents all error codes returned by the ILN contracts, grouped by crate.

invoice_liquidity — ContractError

Source of truth: contracts/invoice_liquidity/src/errors.rs

Note: codes 33 is shared by two variants (FeeOnTransferToken and PayerUnverified) due to a historical renumbering. Both map to the same numeric value at runtime.

Code	Variant	Description	Common cause	Recommended remediation
1	InvoiceNotFound	The requested invoice ID does not exist in contract storage.	Caller supplied an invalid or deleted invoice ID.	Check the invoice ID before calling, or load it from a prior successful submit_invoice response.
2	AlreadyFunded	The invoice is already funded and cannot be funded again.	A second LP attempted to fund an invoice that already reached the funded state.	Read the invoice status first and stop funding once the invoice is funded.
3	AlreadyPaid	The invoice has already been paid.	A payer or LP retried a payment flow after settlement completed.	Treat the invoice as terminal and skip any additional payment, funding, or collection attempts.
4	NotFunded	The invoice has not been funded yet.	A caller tried to settle, claim, or resolve a flow that requires an active funded invoice.	Fund the invoice first, or wait until the correct state transition has occurred.
5	Unauthorized	The caller does not have the required role or authorization for the action.	Wrong account signed the transaction, or the contract has not been configured with the expected admin/role mapping.	Verify the signing account and required role, then retry with the correct address or permissions.
6	InvalidAmount	The provided amount is not acceptable to the contract.	Zero, negative, or otherwise malformed payment/funding amount.	Send a positive amount that matches the invoice rules and token decimals.
7	InvalidDiscountRate	The discount rate is outside the allowed range.	Admin or caller supplied a rate above the contract maximum or in the wrong units.	Use the documented basis-point format and keep the value within the configured bounds.
8	InvalidDueDate	The due date is not valid for invoice creation or update.	Due date is in the past, malformed, or violates contract invariants.	Provide a future due date that satisfies the contract's validation rules.
9	InvoiceDefaulted	The invoice has already defaulted.	Caller tried to fund, pay, cancel, or otherwise act on an invoice that is already in default.	Use the default/appeal flows instead of settlement or funding flows.
10	NothingToClaim	There is no yield or claimable amount available.	LP tried to claim before yield accrued or before funds became claimable.	Wait until the invoice has generated claimable yield, then retry the claim.
11	NotYetDefaulted	The invoice has not reached the default threshold yet.	A default-claim or default-handling function was called too early.	Wait until the invoice is actually defaulted before using the default recovery flow.
12	OverfundingRejected	The funding attempt would exceed the invoice's remaining amount.	LP sent more than the unpaid principal or attempted to top up beyond the cap.	Fund only the remaining unpaid amount, or read the remaining balance first.
13	InvoiceExpired	The invoice has expired and cannot proceed through normal settlement.	Caller tried to fund or pay after the invoice passed its allowed lifecycle window.	Create a fresh invoice or use the appropriate default/closure flow if supported.
14	BatchTooLarge	The submitted batch exceeds the contract's maximum batch size.	Bulk action included too many invoices in one call.	Split the request into smaller batches and retry.
15	AlreadyCancelled	The invoice was already cancelled.	A caller retried a cancel flow or attempted another action after cancellation.	Treat the invoice as terminal and stop sending state-changing actions for it.
16	AlreadyInitialized	The contract was initialized more than once.	A deployment or setup script ran initialization again after state already existed.	Run initialization only once per deployment and guard scripts against duplicate setup.
17	AlreadyAppealed	An appeal already exists for this invoice.	The payer submitted a second appeal for the same defaulted invoice.	Check whether an appeal is already open before creating another one.
18	AppealWindowClosed	The appeal deadline has passed.	The appeal was submitted after the configured appeal window elapsed.	Submit the appeal before the deadline, or update the contract configuration if the window needs to change.
19	NotDefaulted	The invoice is not currently in the defaulted state required by this action.	A caller attempted to appeal or resolve a default-specific flow before default existed.	Wait until the invoice is defaulted, then retry the default-specific action.
20	AlreadyInQueue	The LP has already joined the funding queue for this invoice.	Duplicate queue enrollment request from the same LP.	Skip re-joining if the LP is already queued, or remove the existing queue entry first.
21	NotApprovedFunder	The LP is not the funder approved by the priority queue.	A different LP attempted to fund before queue resolution selected them.	Wait for queue resolution and fund only when the contract assigns that LP as the approved funder.
22	InvoiceAppealed	The invoice is currently in the appealed state.	Another action was attempted while appeal review is still in progress.	Wait for the appeal to resolve before retrying settlement or closure flows.
23	AlreadyDisputed	The invoice is already disputed.	A caller attempted to open a second dispute on the same invoice.	Check dispute status before filing and avoid re-opening an active dispute.
24	NotDisputed	The invoice is not in a disputed state.	A dispute-resolution function was called before a dispute existed.	Open a dispute first, or call the correct function for the current invoice state.
25	InvoiceDisputed	The invoice is under dispute and cannot proceed through normal settlement.	A user attempted to fund, pay, or finalize an invoice while a dispute is active.	Resolve or dismiss the dispute before retrying normal invoice actions.
26	ContractPaused	The contract is currently paused.	An admin paused the protocol for maintenance, incident response, or governance action.	Wait until the contract is unpaused, or ask the admin/governance process to resume it.
27	DueDateTooSoon	The due date is earlier than the minimum allowed horizon.	Invoice due date was set too close to the current ledger time.	Choose a later due date that satisfies the contract's minimum lead time.
28	DueDateTooFar	The due date is later than the maximum allowed horizon.	Invoice due date was set too far in the future.	Reduce the due date to fall within the contract's configured maximum range.
29	SelfInvoice	The payer and invoice creator are the same address.	A caller attempted to create an invoice against themselves.	Use distinct payer and submitter addresses, or fix the invoice data before resubmitting.
30	OverpaymentRejected	The payment amount exceeds the remaining amount due.	Payer attempted to pay more than the invoice balance.	Pay exactly the remaining amount or query the outstanding balance first.
31	PayerReputationTooLow	The payer's reputation is below the configured minimum threshold.	Reputation gate is enabled and the payer score does not meet the contract requirement.	Improve the payer's reputation score, or adjust the minimum threshold through the approved governance/admin path.
32	ArithmeticOverflow	A checked arithmetic operation overflowed.	Large amounts, counters, or computed values exceeded u64/i128 limits during processing.	Re-check inputs for unreasonable values and investigate the caller data or contract math path.
33	FeeOnTransferToken	The token charges a transfer fee, so the received amount differs from the amount sent.	An unsupported fee-on-transfer asset was added or used for settlement.	Use a standard token that transfers the full amount, or remove the fee-on-transfer asset from configuration.
33	PayerUnverified	The oracle did not verify the payer when verification was required.	Oracle verification is enabled, but the payer is not present or not verified in the oracle response.	Use a verified payer account, or disable payer verification if that policy is not required.
34	OracleDataStale	The oracle response is older than the configured freshness window.	The payer-verification oracle data has exceeded max_oracle_age_ledgers.	Refresh oracle data and retry, or increase the freshness window only if that tradeoff is acceptable.
35	InvoiceNftAlreadyExists	An NFT has already been minted for this invoice.	Attempted to mint a duplicate NFT for an invoice that already has one.	Check invoice_nft_exists before minting.
36	InvoiceNftNotFound	No NFT exists for the requested invoice.	Querying or transferring an NFT that was never minted (or was burned).	Verify the invoice was funded and the NFT was minted before querying.
37	InvoiceNftNotOwned	The caller is not the current owner of this NFT.	A non-owner attempted to transfer or burn an NFT.	Verify ownership via invoice_nft_owner before attempting transfer or burn.
38	AmountTooSmall	The invoice amount is below the configurable minimum threshold.	The submitted invoice amount is too low to be economically viable.	Increase the invoice amount to meet the minimum required by the contract configuration.

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insurance_pool — InsuranceError

Source of truth: contracts/insurance_pool/src/lib.rs

Code	Variant	Description	Common cause	Recommended remediation
1	NotInitialized	Contract has not been initialised with an admin.	initialize() was never called, or was called and failed.	Call initialize() with a valid admin address and positive coverage cap.
2	AlreadyClaimed	A claim has already been processed for this invoice.	Duplicate claim attempt for the same invoice ID.	Check is_claimed() before filing; each invoice can only be claimed once.
3	InvalidAmount	Premium / coverage amount must be positive.	Zero or negative amount passed to deposit_premium or initialize.	Send a positive stroop amount.
4	PoolEmpty	Pool has no balance available to pay a claim.	All premiums have been paid out or the pool was never funded.	LPs must deposit premiums before claims can be paid.
5	AlreadyInitialized	Contract is already initialised.	initialize() called more than once.	Initialisation is one-shot; redeploy if a fresh pool is needed.
6	NoPendingProposal	No pending proposal exists for the requested admin action.	execute_coverage_change / execute_admin_transfer / cancel_* called with no queued proposal.	Queue a proposal first via propose_coverage_change or propose_admin_transfer.
7	TimelockNotExpired	The proposal's timelock has not yet expired.	Attempted to execute a timelocked action before the 3-day delay elapsed.	Wait until env.ledger().timestamp() >= eta and retry.
8	ArithmeticOverflow	A checked arithmetic operation overflowed during premium accumulation.	Depositing an amount that would overflow i128 on the running balance or per-LP premium counter.	Ensure deposit amounts are within sane bounds; this should only occur with extreme/malicious inputs.
9	BalanceCapExceeded	Premium deposit would push the pool balance above the configured cap.	The admin has set a BalanceCap and the incoming deposit would exceed it.	Reduce the deposit amount or ask the admin to raise the cap via set_balance_cap.

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iln_governance — GovernanceError

Source of truth: contracts/iln_governance/src/lib.rs

Code	Variant	Description	Common cause	Recommended remediation
1	AlreadyInitialized	The contract was initialized more than once.	Deployment script ran initialization twice.	Run initialization only once per deployment.
2	ProposalNotFound	The specified proposal ID does not exist.	Invalid proposal ID or the proposal was never created.	Verify the proposal ID via get_proposal.
3	VotingEnded	Voting period for this proposal has ended.	Attempted to cast a vote after the voting window closed.	Vote within the configured voting period.
4	ProposalNotActive	The proposal is not in the Active state required by this action.	Action requires an active proposal (e.g. voting) but the proposal is in a different state.	Check proposal status before acting.
5	NoVotingPower	The voter has no governance token balance at the snapshot block.	Voter held no tokens when the proposal was created.	Acquire governance tokens before the proposal's snapshot block.
6	AlreadyVoted	The address has already voted on this proposal.	Double-vote attempt on the same proposal.	Each address may vote once per proposal.
7	VotingOngoing	The proposal's voting period is still in progress.	Attempted to finalize or execute a proposal before voting ended.	Wait for the voting period to end.
8	QuorumNotReached	The proposal did not meet the minimum participation threshold.	Insufficient total votes relative to governance token supply.	Encourage more token holders to vote.
9	ProposalRejected	The proposal was rejected (more votes against than for).	More weight voted against the proposal.	Revise the proposal and resubmit.
10	AlreadyResolved	The proposal has already been resolved (passed/rejected/executed/vetoed).	Action on a proposal that is already in a terminal state.	No further action is possible on a resolved proposal.
11	CannotDelegateToSelf	Delegating to self is not allowed.	delegate_votes called with to == caller.	Delegate to a different address.
12	DelegationCyclePrevented	Delegation would create a cycle.	Delegating A → B → A (directly or transitively).	Break the delegation chain before delegating.
13	TimelockNotExpired	Execution timelock has not yet expired.	Attempted to execute a passed proposal before the governance timelock delay elapsed.	Wait for the timelock delay, then call execute_proposal.
14	Unauthorized	Caller does not have the required role.	Wrong account signed the transaction.	Verify the signing account matches the required role (admin, proposer, etc.).
15	InvalidQuorumBps	Invalid quorum basis points (must be 1..=10,000).	Admin set quorum outside the valid range.	Set quorum between 1 and 10,000 basis points.
16	NotAdmin	Caller is not the admin.	Non-admin attempted an admin-only action (e.g. veto_proposal).	Use the admin account.
17	NotVetoable	Proposal cannot be vetoed in its current status.	Admin attempted to veto a proposal that is not in Active status.	Veto only active proposals.
18	VetoPowerDisabled	Admin veto power has been disabled by governance.	Admin veto was disabled via a governance proposal.	Re-enable veto via governance before using it.
19	InsufficientProposerBalance	Proposer does not hold the minimum required token balance.	Proposer's token balance is below MinProposalBalance.	Acquire enough governance tokens to meet the proposal threshold.

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Keeping This Doc Current

When you add, remove, or renumber variants in any contract's error enum:

1. Update the relevant table above.
2. Update any client-side error mapping in SDKs or examples.
3. Keep the README link below pointing here so the reference remains easy to find.