Several different error messages:
This all started happening when we tried to solve the problem with the website not being fully secure. The Siteground tech said some of the website was still http instead of https. He 'forced the .htaccess file to enforce https. That solved the security problem but the issue started up with not being able to update one of the pages of the website. The rest work fine. The preview error shows two different pages so i suspect that wordpress All Pages list is now pointing to the wrong page for this particular page.
I updated the permalinks to be https.
I deactivated all the plugins and it didnt’ help for that page. All the other pages still seemed to work but Research-reports no longer showed up in the preview panel.
I cleared the cache both at siteground and on the browsers.
If you can’t solve this, I’m still able to save a template of the page.
Should i create a new page of the same info? i need to name it exactly the same so i don’t break any links. will that be a problem once i erase the bad page?