Hello.
The front end views are made for authorized personal only. So you have to be logged-in as a manager to access this views.
I just say, that tickets category flypage must be set to "VMeTicketFlyPage.tpl". And also you must set the VirtueMart configurations to "Enable Downloads" (VirtueMart->Configuration->Downloads). The email with download id is send after the order status is switched to "confirmed" (the status is adjustable) There is no PDF file in the email (normal VM function) but download id and download link.
In the problem with the "missing" configuration file you can try to check the linux access rights of the configuration file. But likely it's caused by some VM module, which is trying to use the configuration file. The reason of the problem is bad use of require_once function in VM module. You can try to turn off some VM modules in Joomla settings.
If you look at the error message (you send) closer, you can see, that the first part of the path is doubled (/home/dnswi/public_html). And of course this file doesn't exists. The path is taken from VM configuration file, and sometimes happen, that the path is in different form (not relative path, but full path). Please, modify the "VM_THEMEPATH" definition is the configuration file before the eTicket installation.
If you'll have some other questions, let ask me again. PeDu