# ErrorInfo

# Interface: ErrorInfo

Defined in: [packages/typescript/ai/src/activities/chat/middleware/types.ts:268](https://github.com/TanStack/ai/blob/main/packages/typescript/ai/src/activities/chat/middleware/types.ts#L268)

Information passed to onError.

## Properties

### duration

```ts
duration: number;
```

Defined in: [packages/typescript/ai/src/activities/chat/middleware/types.ts:272](https://github.com/TanStack/ai/blob/main/packages/typescript/ai/src/activities/chat/middleware/types.ts#L272)

Duration until error in milliseconds

***

### error

```ts
error: unknown;
```

Defined in: [packages/typescript/ai/src/activities/chat/middleware/types.ts:270](https://github.com/TanStack/ai/blob/main/packages/typescript/ai/src/activities/chat/middleware/types.ts#L270)

The error that caused the failure