# Error ReferenceError: \_super is not defined

**URL:** <https://pdfjs.community/t/error-referenceerror-super-is-not-defined/2102>\
**Category:** Technical Support\
**Created:** [October 13, 2022, 2:51pm UTC](https://pdfjs.community/t/error-referenceerror-super-is-not-defined/2102 "2022-10-13T14:51:34Z")\
**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:** [October 13, 2022, 2:51pm UTC](https://pdfjs.community/t/error-referenceerror-super-is-not-defined/2102/3 "2022-10-13T14:51:38Z")

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**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:
- [Angular project WebViewer integration issues](https://pdfjs.express/documentation/get-started-viewer/angular/angular-integration-issues)
- [Measure tools with PDF.js Express](https://pdfjs.express/documentation/measurement/overview)
- [Add signature fields to PDFs - createSignHereElement](https://pdfjs.express/documentation/signature/signature-field.8#createsignhereelement)

APIs:
- [Core.Annotations.SoundAnnotation - new SoundAnnotation( [initializer])](https://pdfjs.express/api/Core.Annotations.SoundAnnotation.html#SoundAnnotation__anchor)
- [Core.Annotations.PolygonAnnotation - new PolygonAnnotation( [initializer])](https://pdfjs.express/api/Core.Annotations.PolygonAnnotation.html#PolygonAnnotation__anchor)
- [Core.Annotations.TextSquigglyAnnotation - new TextSquigglyAnnotation( [initializer])](https://pdfjs.express/api/Core.Annotations.TextSquigglyAnnotation.html#TextSquigglyAnnotation__anchor)

Forums:
- [Annotation line tools javascript error - “\_super is not defined”](https://pdfjs.community/t/annotation-line-tools-javascript-error-super-is-not-defined/2049/15)
- [How to show the annotation on the PDF with selected xfdfString](https://pdfjs.community/t/how-to-show-the-annotation-on-the-pdf-with-selected-xfdfstring/2016/1)
- [Unable to save signatures](https://pdfjs.community/t/unable-to-save-signatures/1622/1)

  
  

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