I use Inkscape 0.91, Mac Mini OS10.5.5 Yosemite and Samsung printer SCX 4300. In response to an earlier query about failure to print I was told to "Save to PDF" This worked for a while but now fails to produce prints. Using the keyboard instruction "cmd->P" has no effect: using the "Print" icon produces the "Ready to Print" box where clicking on "Print" starts the printer running, but the status light changes from green to red and the message window changes to"No Paper. Add paper" despite the fact that the tray is full. Clicking on "Preview" in the "Ready to Print" box produces the message "Error launching Preview. No application is registered as handling this file". If I were more computer literate would I recognise this as the cause of the problem and know how to correct it? Any help will be gratefully received.