> For the complete documentation index, see [llms.txt](https://docs.aeternity.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.aeternity.com/developer-documentation/aepp-sdk-js/docs/guides/error-handling.md).

# Error Handling

This guide shows you how to handle errors originating from the SDK. SDK by default exports the following error classes from file [errors.ts](https://github.com/aeternity/aepp-sdk-js/blob/1cd128798018d98bdd41eff9104442b44b385d46/src/utils/errors.ts)

## Error Hierarchy

```
BaseError
├── ArgumentError
├── IllegalArgumentError
├── ArgumentCountMismatchError
├── InsufficientBalanceError
├── MissingParamError
├── NoSerializerFoundError
├── RequestTimedOutError
├── TxTimedOutError
├── TypeError
├── UnsupportedPlatformError
├── UnsupportedProtocolError
├── NotImplementedError
├── UnsupportedVersionError
├── LogicError
│
├── InternalError
│   └── UnexpectedTsError
│
├── AccountError
│   └── UnavailableAccountError
│
├── AensError
│   ├── AensPointerContextError
│   ├── InsufficientNameFeeError
│   └── InvalidAensNameError
│
├── AeppError
│   ├── InvalidRpcMessageError
│   ├── MissingCallbackError
│   ├── UnAuthorizedAccountError
│   ├── UnknownRpcClientError
│   └── UnsubscribedAccountError
│
├── ChannelError
│   ├── ChannelCallError
│   ├── ChannelConnectionError
│   ├── ChannelPingTimedOutError
│   ├── UnexpectedChannelMessageError
│   ├── ChannelIncomingMessageError
│   └── UnknownChannelStateError
│
├── CompilerError
│   └── InvalidAuthDataError
│
├── ContractError
│   ├── BytecodeMismatchError
│   ├── DuplicateContractError
│   ├── InactiveContractError
│   ├── InvalidMethodInvocationError
│   ├── MissingContractAddressError
│   ├── MissingContractDefError
│   ├── MissingFunctionNameError
│   ├── NodeInvocationError
│   ├── NoSuchContractFunctionError
│   ├── NotPayableFunctionError
│   ├── MissingEventDefinitionError
│   └── AmbiguousEventDefinitionError
│
├── CryptographyError
│   ├── InvalidChecksumError
│   ├── MerkleTreeHashMismatchError
│   ├── MissingNodeInTreeError
│   ├── UnknownNodeLengthError
│   └── UnknownPathNibbleError
│
├── NodeError
│   ├── DuplicateNodeError
│   └── NodeNotFoundError
│
├── TransactionError
│   ├── DecodeError
│   ├── PayloadLengthError
│   ├── DryRunError
│   ├── IllegalBidFeeError
│   ├── InvalidSignatureError
│   ├── InvalidTxError
│   ├── PrefixNotFoundError
│   ├── SchemaNotFoundError
│   ├── TagNotFoundError
│   └── TxNotInChainError
│
├── WalletError
│   ├── AlreadyConnectedError
│   ├── NoWalletConnectedError
│   └── RpcConnectionError
│
├── RpcError
│   ├── RpcInvalidTransactionError
│   ├── RpcRejectedByUserError
│   ├── RpcUnsupportedProtocolError
│   ├── RpcConnectionDenyError
│   ├── RpcNotAuthorizeError
│   ├── RpcPermissionDenyError
│   └── RpcInternalError
```

## Usage

```js
// import required error classes
import {
  AeSdk,
  Node,
  AccountMemory,
  ArgumentError,
  InvalidAensNameError,
} from '@aeternity/aepp-sdk';

// setup
const payerAccount = AccountMemory.generate();
const newUserAccount = AccountMemory.generate();
const node = new Node('https://testnet.aeternity.io');
const aeSdk = new AeSdk({
  nodes: [{ name: 'testnet', instance: node }],
  accounts: [payerAccount, newUserAccount],
});

// catch exceptions
try {
  const spendTxResult = await aeSdk.spend(-1, newUserAccount.address, { onAccount: payerAccount });
} catch (err) {
  if (err instanceof ArgumentError) {
    console.log(`Amount specified is not valid, ${err.message}`);
  } else if (err instanceof InvalidAensNameError) {
    console.log(`Address specified is not valid, ${err.message}`);
  }
}

// using generic error classes
import { AensError, TransactionError, BaseError } from '@aeternity/aepp-sdk';

try {
  const spendTxResult = await aeSdk.spend(1, 'ak_2tv', { onAccount: payerAccount });
} catch (err) {
  if (err instanceof AensError) {
    // address or AENS related errors
  } else if (err instanceof TransactionError) {
    // transaction errors
  } else if (err instanceof BaseError) {
    // match any errors from the SDK
  }
}
```


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://docs.aeternity.com/developer-documentation/aepp-sdk-js/docs/guides/error-handling.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.