# Annotation line tools javascript error - "\_super is not defined"

**URL:** <https://pdfjs.community/t/annotation-line-tools-javascript-error-super-is-not-defined/2049>\
**Category:** Technical Support\
**Created:** [September 20, 2022, 12:54pm UTC](https://pdfjs.community/t/annotation-line-tools-javascript-error-super-is-not-defined/2049 "2022-09-20T12:54:41Z")\
**Posts on this page:** 1\
**Showing post:** 3

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**Author:** ![system](https://canada1.discourse-cdn.com/flex031/uploads/pdfjscommunity/original/1X/ffbcd25c7d423db8d5acd5db201c272f4db306dd.png) [@system](https://pdfjs.community/u/system)\
**Post date:** [September 20, 2022, 12:54pm UTC](https://pdfjs.community/t/annotation-line-tools-javascript-error-super-is-not-defined/2049/3 "2022-09-20T12:54:48Z")

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While you wait for one of our customer support representatives to get back to you, please check out some of these documentation pages:

Guides:
- [Adding your license key - PDF.js Express Plus License Keys](https://pdfjs.express/documentation/get-started/add-license-key#pdf.js-express-plus-license-keys-<span-class='plus'></span>)
- [PDF.js Express Documentation - Our Products - PDF.js Express Plus](https://pdfjs.express/documentation#pdf.js-express-plus)
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APIs:
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- [ExpressUtils(optionsopt) - # async set() → {Promise.}](https://pdfjs.express/api/utils/ExpressUtils.html#set__anchor)
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Forums:
- [TextHighlightAnnotation does not highlight correct text height](https://pdfjs.community/t/texthighlightannotation-does-not-highlight-correct-text-height/1973/1)
- [Printed annotations not always displaying text](https://pdfjs.community/t/printed-annotations-not-always-displaying-text/1937/1)
- [Problem retrieving annotations from sqlite3](https://pdfjs.community/t/problem-retrieving-annotations-from-sqlite3/1617/1)

  
  

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