Please help - LyX 1.5.1 error

[lyn]

Hello,

I am brand new to LyX and just installed LyX Mac Universal 1.5.1 and  
Mac TeX 2007.  I began to work through the Tutorial and opened the  
file: example_raw.lyx.  I tried "view DVI" and got the following error  
message:

LaTeX Error: Cannot determine size of graphic in 5_Applications_LyX_app_Conte

I am unable to find out what this means or how to fix it.  I would  
greatly appreciate your help.

Thank you!
Lyn