Corrupted Content Error

Hello, everyone.

I’m currently at Basic JavaScript course. Yesterday I found a problem. When I clicked Run the Tests, there is no response. When I reloaded the page, the page showed Corrupted Content Error thing. I can’t continue my course.

Today, I could continue for a while, but the problem is showing again. The error shows “Please contact the website owners to inform them of this problem.” so I post this thread.

How can I fix this? How can I prevent this from showing up later?

Thank you.

Edit: I forgot to say that I use Firefox and my current problem is here.


Could this be the same issue as in here?

Do you have any browser plugins / add-ons running in Firefox?

1 Like

Yup, same issue.


  • Widevine Content Decryption Module provided by Google Inc.
  • OpenH264 Video Codec provided by Cisco Systems, Inc.
  • Shockwave Flash


  • ADB Helper
  • Valence
  • Zotero Connector

I use both incognito mode and normal mode but the problem still shows up.

Just now I use Chrome and went through 3 courses but eventually similar problem shows up with different error message:

This page isn’t working sent an invalid response.

I reloaded it but it doesn’t change anything like when I use Firefox.

If you have more information to help our volunteers investigate this, could you please add your comments to the Issue linked above? GitHub Issues are where our code contributors get information about the bugs they are trying to fix.