Originally Posted by till
1) Did you create the mysql database for ISPConfig manually, before you installed ISPConfig?
2) Did you use a mysql user with root priveliges for the ispconfig?
I created It with a user which has root priveliges. I uninstalled ISPConfig and added the Perl modules which were needed at Stap 20, and reinstalled ISPConfig and it works fine!
I would like to thank everybody who helped me solve my problem.