I tried to save a db dump via "phpMyAdmin" because I need to move the site to another server.

the saved db contains only:
SET SQL_MODE = "NO_AUTO_VALUE_ON_ZERO";

/*!40101 SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT */;
/*!40101 SET @OLD_CHARACTER_SET_RESULTS=@@CHARACTER_SET_RESULTS */;
/*!40101 SET @OLD_COLLATION_CONNECTION=@@COLLATION_CONNECTION */;
/*!40101 SET NAMES utf8mb4 */;

/*!40101 SET CHARACTER_SET_CLIENT=@OLD_CHARACTER_SET_CLIENT */;
/*!40101 SET CHARACTER_SET_RESULTS=@OLD_CHARACTER_SET_RESULTS */;
/*!40101 SET COLLATION_CONNECTION=@OLD_COLLATION_CONNECTION */;

When I tried to empty the cache to see if that is the problem, I experienced another problem:
Emptying the cache was not possible, only when reran the script "do_clear"

is that the problem? does anybody have the same issue?

Thanks
Keith.

We run Concrete5 Version 8.03, with clonamental on php 7