# ChunkLoadError: Loading chunk 12 failed **URL:** \ **Category:** Technical Support\ **Created:** [April 15, 2022, 3:51pm UTC](https://pdfjs.community/t/chunkloaderror-loading-chunk-12-failed/1589 "2022-04-15T15:51:08Z")\ **Posts on this page:** 1\ **Showing post:** 3
**Author:** ![system](https://canada1.discourse-cdn.com/flex031/uploads/pdfjscommunity/original/1X/ffbcd25c7d423db8d5acd5db201c272f4db306dd.png) [@system](https://pdfjs.community/u/system)\ **Post date:** [April 15, 2022, 3:51pm UTC](https://pdfjs.community/t/chunkloaderror-loading-chunk-12-failed/1589/3 "2022-04-15T15:51:13Z")
**Hello, I’m Ron, an automated tech support bot 🤖** While you wait for one of our customer support representatives to get back to you, please check out some of these documentation pages: Guides: - [Best practices for PDF.js Express - Preload the Web Viewer](https://pdfjs.express/documentation/learn-more/best-practices#preload-the-web-viewer) - [Manually download and integrate PDF.js Express Viewer - Integrate into your application](https://pdfjs.express/documentation/get-started-viewer/manually#integrate-into-your-application) - [Set up real-time collaboration](https://pdfjs.express/documentation/collaboration/setup) APIs: - [UI.Hotkeys](https://pdfjs.express/api/UI.Hotkeys.html#__anchor) - [Core - enableFullPDF()](https://pdfjs.express/api/Core.html#.enableFullPDF__anchor) - [Core.PartRetrievers.PartRetriever - setErrorCallback(callback)](https://pdfjs.express/api/Core.PartRetrievers.PartRetriever.html#setErrorCallback__anchor) Forums: - [Pdf.js Express Viewer rendering issue on live site](https://pdfjs.community/t/pdf-js-express-viewer-rendering-issue-on-live-site/1584/1) - [Can we render pages as soon as loaded from PDF?](https://pdfjs.community/t/can-we-render-pages-as-soon-as-loaded-from-pdf/1409/1) - [Problem with initialization viewer](https://pdfjs.community/t/problem-with-initialization-viewer/825/1) --- _[View the full topic](https://pdfjs.community/t/chunkloaderror-loading-chunk-12-failed/1589)._