bitweaver is not properly set up:

The directory /var/www/elements/live/storage/prestophoto/ does not exist. To create the directory, execute a command such as:

$ mkdir -m 777 /var/www/elements/live/storage/prestophoto/

Proceed to the installer at /install/install.php after you run the command.
Consult the bitweaver Technical Documentation if you need more help.