[R] PDF output

[Pedro de Barros]

Dear All,

I am trying to save a plot made with ggplot as pdf.

I just created the plot, then printed it to the default graphics 
device (screen). I then tried to create a pdf file choosing (from the 
menus) File-Save As-PDF file. However, I get an error  as
Error: Invalid font type
In addition: Warning messages:
1: font family not found in PostScript font database
2: font family not found in PostScript font database

I am using R2.6.0 on Windows.
I would appreciate any help about how to solve this

Thanks,
Pedro