Flat error in the template

Hello,

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Regards,
Milos

demo.greeksurf.com/administrator/

Username : service
Password : ubzRyIWsQr

Hello,

Your Joomla installation is corrupted. If you go to this page you will see that the installed extensions won't show.

This error probably comes from an invalid upgrade from Joomla 3 to Joomla 4.

Sorry, but this is not an issue with our template. When you fix this and try to install the template again, make sure you are installing version for Joomla 4 (or for Joomla 5 when you upgrade to Joomla 5).

Regards,
Milos

Hii
I restore the backup now have look please

Hello,

Everything works now. I edited the Flat template settings and added the right column. It saves without problems.

Regards,
Milos

Hii i got another problem
while i change style and add row or column then design is freez have look.
i added the user position on the left side similar with content and while i update the design is freez now.
have look and fix it as soon as please
or let me how it will fix