Thanks for your reply. I use Limesurvey Version 1.90+ Build 9160.
I installed the complete package (as it comes with the download) according to the instructions in the manual. Then I imported the entire SQL-Database to the MySQL Server. And it worked perfectly! And I can run the surveys. But there is this message starting from the second question-page (the first page is OK). So this message is messing up the screen for the users.
I attached the screenshot. The template, which I modified (limespired) is also disturbed, but worked fine on the original server.
Thanks again for your kind assistance.