@loopback/docs/site/apidocs/cron.cronjob.onerror.md

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---
lang: en
title: 'API docs: cron.cronjob.onerror'
keywords: LoopBack 4.0, LoopBack 4, Node.js, TypeScript, OpenAPI
sidebar: lb4_sidebar
editurl: https://github.com/loopbackio/loopback-next/tree/master/extensions/cron
permalink: /doc/en/lb4/apidocs.cron.cronjob.onerror.html
---

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[Home](./index.md) &gt; [@loopback/cron](./cron.md) &gt; [CronJob](./cron.cronjob.md) &gt; [onError](./cron.cronjob.onerror.md)

## CronJob.onError() method

**Signature:**

```typescript
onError(listener: (err: unknown) => void): void;
```

## Parameters

<table><thead><tr><th>

Parameter


</th><th>

Type


</th><th>

Description


</th></tr></thead>
<tbody><tr><td markdown="1">

listener


</td><td markdown="1">

(err: unknown) =&gt; void


</td><td markdown="1">


</td></tr>
</tbody></table>

**Returns:**

void