Why am I getting an error while trying to edit my pages?
This problem is present while the user is trying to leave the page without pressing on the X (exit) button, but instead, the user is leaving the page editor with the browser "back" button:
Example: while editing the page, if you decide to close down or go back to the tunnel window, you should always leave the page by clicking on the X at the top right corner of your screen, instead of clicking on the back button at the top left side of your screen
Clicking on the back button will result in an error when you are trying to edit the same page after some time:
You can remedy the situation by going inside the visual editor for your page and exiting with the X button at the top right corner of the screen. After that, you will be able to edit your pages without the error popup ever popping up again.