Are you using a VPN? Sometimes I'm prevented from editing Wikipedia when I am and the error message is similar.
l tried using, didn't worked. After that worked when i used the Wi Fi of my phone, just for a brief period of time and after that came the same mistake. Now i can't even log my account, the new error is:
There seems to be a problem with your login session; this action has been canceled as a precaution against session hijacking. Go back to the previous page, reload that page and then try again.