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Symptoms
You see the following error message when you configure a SharePoint Framework (SPFx) component on a page in SharePoint Online:
Something went wrong
If the problem persists, contact the site administrator and give them the information in Technical Details.
Technical Details
[SPLoaderError.loadComponentError]:
***Failed to load component "11111111-2017-4bc3-9a39-18dfdd167e1b" (DocumentNavigationWebPart).
Original error: ***Failed to load entry point from component "11111111-2017-4bc3-9a39-18dfdd167e1b" (DocumentNavigationWebPart).
Original error: Error loading https://component-id.invalid/11111111-2017-4bc3-9a39-18dfdd167e1b_0.0.1
Cannot redefine non-configurable property 'startsWith'
Cause
This is a known issue when using Internet Explorer 11 with SharePoint Online. It occurs after the addition of a pollyfill.js file to support modern styling in SharePoint Online. As a result, third-party web parts that use polyfill.js will not work on pages in IE 11.
Resolution
Microsoft is researching this problem and will post more information as it becomes available.
More information
Still need help? Go to Microsoft Community.