Issues Editing Course Page: Need Your Help!

Hi everyone,

I'm having some issues editing the course page to add a link to the CTA button. When I try to change or save it, I get the following message: (ERROR: No route was found that matches the URL and request method.)

Before you ask, I'm using the slug "portal". The only change I made was translating using "Loco Translate", but I was careful not to mess with any parameters.

Has anyone experienced this or have any tips to solve it? Thanks in advance for your help!