Hi,
I have 2 hosters:
The Installation by the first hosters was normal.
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Although I´ve got the message that everything was correct, the installation by the second hoster was not completely.
As I clicked in the admin-area to the component Joomla-Visites I got the error:
Failed opening required 'administrator/components/com_joomla-visites/libs/smarty/Smarty.class.php'
As I looked per ftp I must see, that some pathes in the directory /administrator/components/com_joomla-visites/libs/ really were not installed.
Only the first path artichow was created!
What can this mean - thank you rockpianist