# Use Error Handling

The JSON object is placed in the error description field within the error row. **Error handling** must be enabled on the step to capture the error columns and descriptions. On the canvas, right-click the Copybook Input step and select **Error Handling** to open the Step error handling settings window and configure the error output column names. See the [Use the Transformation menu](/pdia-data-integration/9.3-data-integration/data-integration-perspective-in-the-pdi-client/work-with-transformations-cp/use-the-transformation-menu.md) for details.

The following table details the JSON object format for the output error stream.

| Key        | Type    | Example                                  | Description                                                   |
| ---------- | ------- | ---------------------------------------- | ------------------------------------------------------------- |
| record     | Integer | 0                                        | The record number originating from the Copybook Input step.   |
| converter  | String  | BigNumberColumnConverter                 | The converter class that originated the error.                |
| exception  | String  | RecordException                          | The exception class of the error.                             |
| message    | String  | Invalid sign in field: OPEN-YEAR         | The error message text, if it exists.                         |
| fieldName  | String  | OPEN-YEAR                                | The name of field that has the error.                         |
| position   | Integer | 22                                       | The position of the field.                                    |
| length     | Integer | 3                                        | The length of the field.                                      |
| value      | String  | 404040                                   | The value read as a hexadecimal string.                       |
| recordHash | String  | 240c992c3aaebccf6dc0e99a4ed1a447e4811bed | The record checksum originating from the Copybook Input step. |


---

# Agent Instructions: 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:

```
GET https://docs.pentaho.com/pdia-data-integration/9.3-data-integration/pdi-transformation-steps-reference-overview/copybook-input-pdi-step/use-error-handling-copybook-input-step.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
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.