Suddenly forbidden 403 error on some pages

Please check the permissions of files and folders.
All folders should have permission set to 755 and files should have 644 . If permissions are different than specified, please try changing the permissions.

You can easily check and change permissions using filezilla.

Let me know if it helps.

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)