> ## Documentation Index > Fetch the complete documentation index at: https://base-a060aa97-docs-add-b20-spec.mintlify.site/llms.txt > Use this file to discover all available pages before exploring further. # Errors & events index > Reverse lookup B20 errors and events by selector or topic. ## Index | Type | Name | Selector / topic0 | Interface | Meaning | | ----- | ---------------------------------- | -------------------------------------------------------------------- | --------------------- | ----------------------------------------------------------------------------------------------------- | | error | `AccessControlBadConfirmation` | `0x6697b232` | `IB20` | The `callerConfirmation` argument to `renounceRole` was not `msg.sender`. | | error | `AccessControlUnauthorizedAccount` | `0xe2517d3f` | `IB20` | `account` does not hold `neededRole`. | | error | `AccountNotBlocked` | `0x64a5cb46` | `IB20` | The deprecated `burnBlocked` was called against a `from` that is currently authorized under | | error | `AccountNotSeizable` | `0x91dbbc8d` | `IB20` | `seizeWithMemo` was called against a `from` that is currently authorized under | | event | `AllowlistUpdated` | `0x18c46532f90187ba11e436e21da087b684801d7f0787f2043f26f079c91e9ef0` | `IPolicyRegistry` | One or more accounts had their ALLOWLIST membership set to `allowed` in a single batch. | | error | `AlreadyActivated` | `0x866b0041` | `IActivationRegistry` | Feature is already activated. | | event | `Announcement` | `0xccebf8218a62875909564adef86a6f4df81503cb617221e793357d62f8e813f7` | `IB20Asset` | Emitted by `announce` to open an announcement bracket. | | error | `AnnouncementIdAlreadyUsed` | `0xd10b3c9e` | `IB20Asset` | `announce` was called with an `id` that has already been consumed. | | error | `AnnouncementInProgress` | `0x5c5f0829` | `IB20Asset` | An inner call dispatched by `announce` tried to re-invoke `announce`. | | event | `Approval` | `0x8c5be1e5ebec7d5bd14f71427d1e84f3dd0314c0f7b2291e5b200ac8c7c3b925` | `IB20` | ERC-20 approval event. Emitted by `approve` and `permit`. | | event | `B20Created` | `0x86ee7a93da43b07286ea4c925a31ba17c41eb00c5ea396883bf32abfe5e73cfc` | `IB20Factory` | Emitted once per `createB20` invocation, after the token's identity is sealed | | error | `BatchSizeTooLarge` | `0x083e2f67` | `IPolicyRegistry` | A membership batch exceeded the registry limit. | | event | `BlocklistUpdated` | `0x2ff63c102b1b9fd7f5d39f83039c5d6aaf50a414a4f2def2704e41be2628f1e3` | `IPolicyRegistry` | One or more accounts had their BLOCKLIST membership set to `blocked` in a single batch. | | event | `BurnedBlocked` | `0x0b552e96653fd6842da37c477005d3b5c08a8c7d3631b1f43787b2dc9a1006a3` | `IB20` | Emitted by the deprecated `burnBlocked` in addition to `Transfer(from, address(0), amount)`. | | error | `ChildPoliciesOutsideOfRange` | `0xcbdee0f6` | `IPolicyRegistry` | A composite policy was created or updated with a child-policy count outside the | | event | `CompositePolicyUpdated` | `0x4ff6adaab31b0df87aa7b8b7320c52b8b3b5eede3bf28a6baaaa8b8b7e1d6363` | `IPolicyRegistry` | A composite policy's child set was set or replaced in full with `childPolicyIds`. Emitted | | error | `ContractPaused` | `0xf9df5ac9` | `IB20` | The `PausableFeature` covering this operation is currently paused. | | event | `ContractURIUpdated` | `0xa5d4097edda6d87cb9329af83fb3712ef77eeb13738ffe43cc35a4ce305ad962` | `IB20` | Emitted by `updateContractURI`. Per ERC-7572, parameterless: integrators re-fetch `contractURI()`. | | error | `DelegateCallNotAllowed` | `0x0d89438e` | `IActivationRegistry` | The precompile was invoked via `DELEGATECALL` or `CALLCODE`. | | error | `EffectiveAtInPast` | `0x14119cf6` | `IB20Asset` | `setUIMultiplier` was called with an `effectiveAt` that is not in the future | | error | `EffectiveAtTooFar` | `0x1ce214fa` | `IB20Asset` | `setUIMultiplier` was called with an `effectiveAt` above `type(uint64).max`, the | | event | `EIP712DomainChanged` | `0x0a6387c9ea3628b88a633bb4f3b151770f70085117a15f9bf3787cda53f13d31` | `IB20` | ERC-5267 domain-change signal. Emitted exactly once per successful `updateName` call, | | error | `EmptyBatch` | `0xc2e5347d` | `IB20Asset` | A batched function was called with empty arrays. | | error | `EmptyFeatureSet` | `0x4861ff45` | `IB20` | An empty array was passed to a function that requires at least one element. | | event | `EndAnnouncement` | `0x96d64dafe2c790596430196b982ad1da3221cb3b0f4e6e2df77f2e4f71a90037` | `IB20Asset` | Emitted by `announce` to close the bracket opened by the paired `Announcement` with the same `id`. | | error | `ExpiredSignature` | `0xbd2a913c` | `IB20` | An EIP-2612 `permit` was submitted with a `deadline` strictly less than `block.timestamp`. | | event | `ExtraMetadataUpdated` | `0xd7bb345be29e78d635203d40fe0567e7ef19d5cd5cc5fcd25f768b8063e82aa1` | `IB20Asset` | Emitted by `updateExtraMetadata`. An empty `value` indicates removal. | | event | `FeatureActivated` | `0x8c7a0ecdbb8d96e867e43ec1aef80027976ee493c18bef399fa799ed19752451` | `IActivationRegistry` | Emitted when `feature` is activated. | | event | `FeatureDeactivated` | `0x15bf65a782c3258c63268ba9d7aed710cf9f9315d3687d9a4632ccdad7926c84` | `IActivationRegistry` | Emitted when `feature` is deactivated. | | error | `FeatureNotActivated` | `0xb9b2a425` | `IActivationRegistry` | Feature is not activated. | | error | `IncompatiblePolicyType` | `0xf1011ef5` | `IPolicyRegistry` | The operation is incompatible with the policy's type. | | error | `InitCallFailed` | `0x4eae0860` | `IB20Factory` | One of the `initCalls` reverted. The factory bubbles the underlying revert reason | | error | `InsufficientAllowance` | `0x192b9e4e` | `IB20` | `spender`'s allowance is less than `needed` for the requested `transferFrom`. | | error | `InsufficientBalance` | `0xdb42144d` | `IB20` | `sender`'s balance is less than `needed` for the requested transfer or burn. | | error | `InternalCallFailed` | `0xb288a127` | `IB20Asset` | An inner call dispatched by `announce` reverted with an ordinary revert; its reason is | | error | `InternalCallMalformed` | `0x4e2f143e` | `IB20Asset` | An inner call dispatched by `announce` was shorter than four bytes. | | error | `InvalidAmount` | `0x2c5211c6` | `IB20` | An amount argument was zero where a non-zero value is required. Not used for ERC-20 amount arguments. | | error | `InvalidApprover` | `0x8bc146c4` | `IB20` | The approval's `owner` address is invalid (typically `address(0)`). | | error | `InvalidChildPolicy` | `0x46508ef6` | `IPolicyRegistry` | Composite policies are not simple policies. Child policies must be existing | | error | `InvalidCurrency` | `0x997c1de8` | `IB20Factory` | The stablecoin `currency` was non-empty but contained a non-`A`-`Z` byte. | | error | `InvalidDecimals` | `0xca950391` | `IB20Factory` | The asset `decimals` was outside the allowed inclusive range | | error | `InvalidMetadataKey` | `0x86ea3abb` | `IB20Asset` | `updateExtraMetadata` was called with an empty `key`. | | error | `InvalidMultiplier` | `0x6f12f3dc` | `IB20Asset` | A multiplier setter (`setUIMultiplier` or `updateMultiplier`) was called with a | | error | `InvalidReceiver` | `0x9cfea583` | `IB20` | The transfer's destination address is invalid (typically `address(0)`). | | error | `InvalidSender` | `0x4c14f64c` | `IB20` | The transfer's source address is invalid (typically `address(0)`). | | error | `InvalidSigner` | `0x7ba5ffb5` | `IB20` | ECDSA recovery on an EIP-2612 `permit` returned `signer`, which does not match the claimed `owner`. | | error | `InvalidSpender` | `0x4e15efda` | `IB20` | The approval's `spender` address is invalid (typically `address(0)`). | | error | `InvalidSupplyCap` | `0x0a3780ce` | `IB20` | The proposed supply cap is outside the permitted range: below the current | | error | `InvalidVariant` | `0xf10e8e43` | `IB20Factory` | `variant` is not a recognized `B20Variant`. | | error | `LastAdminCannotRenounce` | `0x361513e7` | `IB20` | `renounceRole(DEFAULT_ADMIN_ROLE, ...)` was called by the sole remaining admin. | | event | `LastAdminRenounced` | `0xe8d3a9872e7ca325571ff1e4c51ddd69090a0345240cc605ccde365ec867cc67` | `IB20` | Emitted by `renounceLastAdmin` in addition to the standard | | error | `LengthMismatch` | `0xab8b67c6` | `IB20Asset` | A batched function was called with parallel arrays of differing lengths. | | event | `Memo` | `0x6989f5818dcfd11f8cd53b27c94cec33dae1589735f03e639cba54553a1825e8` | `IB20` | Emitted by `transferWithMemo`, `transferFromWithMemo`, `mintWithMemo`, and `burnWithMemo` | | error | `MissingRequiredField` | `0x4a43ae87` | `IB20Factory` | A required string argument was the empty string. | | event | `MultiplierUpdateCancelled` | `0xf8929975f3e67bbd1e5ec70d4cceaa7cce7ea0e811720f29c96cf1724de09397` | `IB20Asset` | A scheduled multiplier update was cancelled. Emitted by `cancelScheduledMultiplier`, | | event | `NameUpdated` | `0x74321da206c1b9fa34367f7ece59ca49371dcd13820b9a5c3767ae1ecceed51a` | `IB20` | Emitted by `updateName`. Carries the new name string. | | error | `NonPayable` | `0x6fb1b0e9` | `IB20` | ETH was attached to a call targeting a nonpayable token selector. | | error | `NonPayable` | `0x6fb1b0e9` | `IB20Factory` | ETH was attached to a call targeting a nonpayable factory selector. | | error | `NonPayable` | `0x6fb1b0e9` | `IPolicyRegistry` | ETH was attached to a call targeting a nonpayable policy registry selector. | | error | `NoPendingAdmin` | `0xb4539afa` | `IPolicyRegistry` | `finalizeUpdateAdmin` was called with no pending admin staged. | | error | `NoScheduledMultiplier` | `0x002e806f` | `IB20Asset` | `cancelScheduledMultiplier` was called when there is no live pending update | | error | `NotSoleAdmin` | `0x2a98e73b` | `IB20` | `renounceLastAdmin()` was called when other accounts also hold `DEFAULT_ADMIN_ROLE`. | | event | `Paused` | `0x43e072977b8112813d7c2aa0b63d3c121c1fe3e714e6d2eacb5735fe4027e976` | `IB20` | Emitted by `pause`. `features` is the argument to the call (not the resulting paused state). | | event | `PolicyAdminStaged` | `0xdbf3b34a4c956c56ca05cd4b8f9293a4347ad61994445a4b89817d4a19561136` | `IPolicyRegistry` | A new admin was staged. `pendingAdmin == address(0)` clears a prior nomination. | | event | `PolicyAdminUpdated` | `0x98925cfb1bc09c5b43dd0dd56d3d95aa04fb3300927580cc588c3f5dd58c15e1` | `IPolicyRegistry` | The active admin changed. `newAdmin == address(0)` indicates renunciation; | | event | `PolicyCreated` | `0xdc870ce85be577234b8548f42b93f84bbff6d0c1f38ee725c809c49932a13885` | `IPolicyRegistry` | A new policy was created. | | error | `PolicyForbids` | `0xa43fec12` | `IB20` | A policy slot denied the operation. | | error | `PolicyNotFound` | `0xcccad523` | `IB20` | The provided policy ID does not exist in the policy registry. | | error | `PolicyNotFound` | `0x720caa4f` | `IPolicyRegistry` | The referenced policy ID does not exist. | | event | `PolicyUpdated` | `0x8b4790f7ff717fc8f60f07ae099e47ef318dc04b37ae98056b50a22b79056626` | `IB20` | Emitted by `updatePolicy` when a token's policy slot is changed. Initial slot assignment at | | event | `RoleAdminChanged` | `0xbd79b86ffe0ab8e8776151514217cd7cacd52c909f66475c3af44e129f0b00ff` | `IB20` | Emitted by `setRoleAdmin` when the admin role for `role` changes. | | event | `RoleGranted` | `0x2f8788117e7eff1d82e926ec794901d17c78024a50270940304540a733656f0d` | `IB20` | Emitted when `account` is granted `role`. `sender` is the originating caller. | | event | `RoleRevoked` | `0xf6391f5c32d9c69d2a47ea670b442974b53935d1edc7fd64eb21e047a839171b` | `IB20` | Emitted when `role` is revoked from `account`. `sender` is the originating caller | | error | `ScheduleOverlap` | `0x91a52665` | `IB20Asset` | `setUIMultiplier` was called while a live pending update already exists | | event | `Seized` | `0xa9aec5d8b86e2fa2fd6ac3af62f2622e3dfdab1967d4cbbb56a5df7d74cb887c` | `IB20` | Emitted by `seizeWithMemo` in addition to `Transfer(from, to, amount)` (and the | | error | `StaticCallNotAllowed` | `0xbeaba5b7` | `IActivationRegistry` | A state-mutating entry point was invoked from a `STATICCALL` frame. | | error | `SupplyCapExceeded` | `0x4b344b11` | `IB20` | The mint would push `totalSupply` past the configured cap. | | event | `SupplyCapUpdated` | `0x6d14f44808ce024f263432bc38d019a9951fbe674e9898b54844dbc8dc09c23a` | `IB20` | Emitted by `updateSupplyCap`. | | event | `SymbolUpdated` | `0x64e8b5c6dcea43dd79766bb3b8af7c45968d12b68c960cf2da23856f34d598d4` | `IB20` | Emitted by `updateSymbol`. Carries the new symbol string. | | error | `TokenAlreadyExists` | `0x15ef3a57` | `IB20Factory` | A token already exists at the deterministic address derived from | | event | `Transfer` | `0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef` | `IB20` | ERC-20 transfer event. Emitted on every successful transfer (including memo'd variants), | | error | `Unauthorized` | `0x8e4a23d6` | `IActivationRegistry` | Caller is not the activation admin. | | error | `Unauthorized` | `0x82b42900` | `IB20` | Caller failed a positional authorization check that is not expressible as "missing role X". | | error | `Unauthorized` | `0x82b42900` | `IPolicyRegistry` | Caller is not the admin required by the attempted operation. | | event | `Unpaused` | `0xdc6281474ea3dea2a856e225c7ba3edf427de9164495817c4d49a595e683fed4` | `IB20` | Emitted by `unpause`. `features` is the argument to the call (not the resulting paused state). | | error | `UnsupportedPolicyType` | `0xcdd98a4a` | `IB20` | `policyScope` is not a slot this token (or its variant) supports. | | error | `UnsupportedVersion` | `0x6f3c1955` | `IB20Factory` | The leading `version` byte in `params` does not match any known encoding for the requested variant. | | error | `ZeroAddress` | `0xd92e233d` | `IPolicyRegistry` | A required address argument was the zero address. |