Hi I have two identical installations of Joomla with SP pagebuilder PRO installed. One of them works like a charm. On the site I mention below the frontend editing works as long as i haven't assigned the page to the main menu. When I assign the SP pagebuilder page to the main menu i get the following error message. I have reinstalled Joomla 2 times with the same result. I have cleared the cache both in Joomla and the browsers I have used (edge, chrome, firefox) I have compared the two installations but I can't find any difference in the settings. I'm stuck right now and need help.

"The requested page can't be found. An error has occurred while processing your request. You may not be able to visit this page because of: an out-of-date bookmark/favourite a mistyped address a search engine that has an out-of-date listing for this site you have no access to this page"

Joomla! 6.0.2 Stable [ Kuimarisha ] 6-January-2026 16:00 UTC Template Cassiopeia PHP Version 8.3.30 SP pagebuilder pro v6.2.2 (i have also tried SP pagebuilder pro v6.2.3)