please, check if this folders are writable for the PHP server (including all the subfolders and it''s files)

/components/com_virtuemart/themes/default/
/administrator/components/com_virtuemart/classes/

The second fail should be in the virtuemart configuration file. So you should try to uninstall the VMeTicket component, unpack the installation pack to some folder, open the file /admin/install.eticket.php and edit the row n.43

$theme = JPATH_ROOT.VM_THEMEPATH;
change to the folder of you flypage. probably:
$theme = '/var/www/event/components/com_virtuemart/themes/default/';

Save the file and install the component again (from the folder or create new zip file). After the installation goto the VMeTicket administration->settings, check all the values if they are right and save it.

If some errors remains, please, write me.

Fantastic Support pedu, you are a star, installed like charm thanks