# Issue with Config File

**URL:** <https://pdfjs.community/t/issue-with-config-file/1031>\
**Category:** Technical Support\
**Tags:** pdfjs-express\
**Created:** [October 6, 2021, 7:53am UTC](https://pdfjs.community/t/issue-with-config-file/1031 "2021-10-06T07:53:54Z")\
**Posts on this page:** 1\
**Showing post:** 2

<div class="post-metadata">

**Author:** ![system](https://canada1.discourse-cdn.com/flex031/uploads/pdfjscommunity/original/1X/ffbcd25c7d423db8d5acd5db201c272f4db306dd.png) [@system](https://pdfjs.community/u/system)\
**Post date:** [October 6, 2021, 7:53am UTC](https://pdfjs.community/t/issue-with-config-file/1031/2 "2021-10-06T07:53:59Z")

</div>

**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:
- [Blazor project PDF.js Express WebViewer integration issues - MIME type issues](https://pdfjs.express/documentation/get-started/blazor/blazor-integration-issues#mime-type-issues)
- [Integrating PDF.js Express Viewer into an existing Blazor project - Integrate PDF.js Express Viewer](https://pdfjs.express/documentation/get-started-viewer/blazor/exist-project#integrate-pdf.js-express-viewer)
- [Integrating PDF.js Express Plus into an existing Blazor project - Integrate PDF.js Express WebViewer](https://pdfjs.express/documentation/get-started/blazor/exist-project#integrate-pdf.js-express-webviewer)

APIs:
- [UI.Header - get(dataElement)](https://pdfjs.express/api/UI.Header.html#get__anchor)
- [Core.Annotations.WidgetFlags - new WidgetFlags(options)](https://pdfjs.express/api/Core.Annotations.WidgetFlags.html#WidgetFlags__anchor)
- [Core.Math.Matrix - get(row, column)](https://pdfjs.express/api/Core.Math.Matrix.html#get__anchor)

Forums:
- [How to raise AnnotationsLoaded Event?](https://pdfjs.community/t/how-to-raise-annotationsloaded-event/1015/1)
- [Blazor Demo Error](https://pdfjs.community/t/blazor-demo-error/342/1)
- [IE 11 Not work on builded React code](https://pdfjs.community/t/ie-11-not-work-on-builded-react-code/227/1)

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_[View the full topic](https://pdfjs.community/t/issue-with-config-file/1031)._