Hi there!

Sorry for your experience.

Did you follow the Joomla upgrade process carefully? From Joomla 3 to 4 or Joomla 4 to 5?

https://www.joomshaper.com/blog/how-to-update-your-site-to-joomla-4

https://www.joomshaper.com/blog/how-to-update-your-site-to-joomla-5

If yes, would you please give me your admin access to check the issue?

Best regards,

Thanks Rshida,

Below are my admin credential.

Before upgrade, i could loginto admin so copied files manually.

Now i have restored the old site plischeck and see how it behaves coz here i cant update.

Hi,

Sorry for the delay. Is this your restored version? Please check the hidden content.

HI Rashida,

The admin panel still shows same issue i.e. Error The template for this display is not available.

No restored yet.

Hello,

Don't you have a backup of your full site before the Joomla update? If yes, please restore that. The admin panel is not eligible to work in this state.

Please note that, core Joomla issues are not in our support range.

Thanks for understanding...

Alright Rashida,

Let me fix my side.

BTW

Error that you presented was from plugin that cannot work in Joomla 4/5. Probably you forgot to disable all extra installed plugin before Joomla Upgrade process. Please do it !