Application error while trying to enter administrator

Hi! I recently changed my hosting from hostinger to 000webhost and I have faced a problem. When I try to enter to the administrator page of my website, it shows the following problem: Application error
An error occurred in the website and your page could not be displayed. If you are the website owner, check your logs for details. The website is built on joomla 2.5. The link: salimzade.com/administrator. Any ideas how can I solve this problem?

Is it a WordPress website?

No, it is joomla.

Joomla 2.5 is well outdated now, if you want to try to use it then maybe lower the PHP version via General Settings on 000webhost.com

Else I’d recommend a fresh install of the latest version if possible.

Thanks, decreasing the php version seems to work, but now when I try to write my login and password, it says ‘your connection to this site is not private’.

Following this tutorial should fix the issue