If you have deactivated Admin Tools then it doesn't run and cannot change how your site behaves. So, according to what you described, Admin Tools is the one thing that cannot be related to your issue. Normally I could have given you some ideas where to look next based on the error message but I don't speak Arabic and since it's an image I cannot use Google Translate to understand what it reads.
If I were to make a wild guess, based solely on my experience, I'd say that you need to delete the .htaccess and .htpasswd files from your site's administrator directory. These files may be hidden.
Nicholas K. Dionysopoulos
Lead Developer and Director
🇬🇷Greek: native 🇬🇧English: excellent 🇫🇷French: basic • 🕐 My time zone is Europe / Athens
Please keep in mind my timezone and cultural differences when reading my replies. Thank you!