# 'instance' is not defined **URL:** \ **Category:** Technical Support\ **Tags:** pdfjs-express\ **Created:** [January 18, 2022, 4:39am UTC](https://pdfjs.community/t/instance-is-not-defined/1302 "2022-01-18T04:39:27Z")\ **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:** [January 18, 2022, 4:39am UTC](https://pdfjs.community/t/instance-is-not-defined/1302/3 "2022-01-18T04:39:32Z")
**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: - [TypeScript PDF.js Viewer - Customizable](https://pdfjs.express/documentation/typescript#customizable) - [PDF.js Express Documentation - Our Products - PDF.js Express Viewer](https://pdfjs.express/documentation#pdf.js-express-viewer) - [PDF.js Express Viewer Overview - What is PDF.js Express Viewer?](https://pdfjs.express/documentation/get-started-viewer#what-is-pdf.js-express-viewer?) APIs: - [PDF.js Express Utilities](https://pdfjs.express/api/utils/index.html#__anchor) - [Core.DisplayModeManager - new DisplayModeManager(docViewer)](https://pdfjs.express/api/Core.DisplayModeManager.html#DisplayModeManager__anchor) - [Core.DocumentViewer - loadDocument(source [, options])](https://pdfjs.express/api/Core.DocumentViewer.html#loadDocument__anchor) Forums: - [Licensing problem in a intranet environmnet](https://pdfjs.community/t/licensing-problem-in-a-intranet-environmnet/1116/1) - [Undefined is not a valid destination type](https://pdfjs.community/t/undefined-is-not-a-valid-destination-type/809/1) - [Issue with Config File](https://pdfjs.community/t/issue-with-config-file/1031/1) --- _[View the full topic](https://pdfjs.community/t/instance-is-not-defined/1302)._