---
title: "TilePreloadErrorCallback | JavaScript maps SDK"
description: "Documentation for MapTiler SDK"
---

> For AI agents: a documentation index is available at [/llms.txt](https://docs.maptiler.com/llms.txt). Markdown versions of all pages are available by appending .md to any URL.

# Type Alias TilePreloadErrorCallback

TilePreloadErrorCallback: (error: unknown) \=> void

Called when a tile fails to load during preloading.

#### Type Declaration

-   -   (error: unknown): void
    -   #### Parameters
        
        -   error: unknown
            
            The error that occurred
            
        
        #### Returns void