[Home](./index.md) > [@firebase/firestore](./firestore.md) > [/](./firestore_.md) > [LoadBundleTask](./firestore_.loadbundletask.md) > [catch](./firestore_.loadbundletask.catch.md) ## LoadBundleTask.catch() method Implements the `Promise.catch` interface. Signature: ```typescript catch(onRejected: (a: Error) => R | PromiseLike): Promise; ``` ## Parameters | Parameter | Type | Description | | --- | --- | --- | | onRejected | (a: Error) => R \| PromiseLike<R> | Called when an error occurs during bundle loading. | Returns: Promise<R \| [LoadBundleTaskProgress](./firestore_.loadbundletaskprogress.md)>