Today, I came across a very strange error, for some reason when I navigate to SharePointSite/SitePages/ and try to create a new Web Part Page, I get the following error.

This was quite strange, as it used to work perfectly regardless which browser I was using.

I tried couple of things:

  • Try different browsers
  • Clean the cache and restart the process
  • Logout of Office 365 and log in again

Apparently, for some weird reasons, I was not able to create web part pages in the modern UI.

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