Can't change or create in fresh install Topic is solved

[Patruud]

Hi, been away from Joomla for years, but back. And confused :-)
I did a fresh install of the latest version, only a fresh template installed, but no other extensions.

I get a lot of errors. Trying to make a new category, create a new image folder, changing back the standard template to defaul. It won't let me do any of that. When I try to make a new image folder, I get this:

Error creating folder.
×
Error
Class "Joomla\Plugin\Finder\Content\Extension\Content" not found

When I try to change the default template I get:
An error has occurred.
0 Class "Joomla\CMS\MVC\Controller\AdminController" not found

I'm not good at code, sorry. Anyone have any idea?

[toivo]

Welcome to the Joomla forum!

It is clear that the installation has not worked correctly. Does the web server fulfil the Joomla 5.0 Technical Requirements?

Please post the results from the Forum Post Assistant (FPA) by following the instructions at https://forumpostassistant.github.io/docs/ so that our volunteer Joomla experts can review the configuration.

[AMurray]

There's only one front-end template, what template were you using, that you changed it back to Cassiopeia (the default)?

[Patruud]

The problem is solved. But in a weird way. I deleted the installation (FTP version). I couldn't install the latest version from Installatron, so I installed the last 4.x.x version through that service. That one worked. After that, I upgraded to the latest 5.x.x version through the Joomla backend. And since then everything works.

[AMurray]

I'd start over and note use Installatron, and install by the documented method on Joomla.org - that's the only supported method you will get from the forum members.

https://docs.joomla.org/J4.x:Installing_Joomla