# IE 11 Not work on builded React code

**URL:** <https://pdfjs.community/t/ie-11-not-work-on-builded-react-code/227>\
**Category:** Technical Support\
**Created:** [August 24, 2020, 9:43am UTC](https://pdfjs.community/t/ie-11-not-work-on-builded-react-code/227 "2020-08-24T09:43:22Z")\
**Posts on this page:** 1\
**Showing post:** 1

<div class="post-metadata">

**Author:** ![ysc692](https://avatars.discourse-cdn.com/v4/letter/y/58956e/32.png) [@ysc692](https://pdfjs.community/u/ysc692)\
**Post date:** [August 24, 2020, 9:43am UTC](https://pdfjs.community/t/ie-11-not-work-on-builded-react-code/227/1 "2020-08-24T09:43:22Z")

</div>

Dear Support,

I use your React Sample to create my program.

When i run “npm start” at the localhost, the IE 11 can 100% success run my program

But i “npm run build” my program and copy the build folder to my IIS server the show the blank page (just only can show meta title)

I m open F12 Developer Tools on IE 11, show 404 file missing of file “lib/webviewer.min.js” and the Console error:

SCRIPT1010: Expected identifier  
PDFJSExpress (1,1310849852)

SCRIPT1010: Expected identifier  
1.b7a27b1d.chunk.js (1,9643)

I was download and upload “lib/webviewer.min.js” and “lib” folder to my IIS Folder fixed 404 not found but also not work. show the error as below :

SCRIPT1010: Expected identifier  
webviewer.min.js (1,1029)

SCRIPT1010: Expected identifier  
PDFJSExpress (1,1310849852)

SCRIPT1010: Expected identifier  
1.b7a27b1d.chunk.js (1,9643)

I can sure 100% work on Chrome and Firefox and Clean IE11 browser cache.

So do you know whats problem & can help?

My IE  
Version : 11.1039.17763.0  
Update Versions: 11.0.175(KB4537767)

Thanks

---

_[View the full topic](https://pdfjs.community/t/ie-11-not-work-on-builded-react-code/227)._