You did not read Section 4 carefully. I said in the manual that you need to open View-->View Messages, and check the messages there. A simple error dialogue box saying "An error occured while running Rscript --verbose..." is not helpful for diagnosis at all. BTW, your document compiles fine under my system (LyX 2.0.4, Ubuntu).
To JMarc: I keep on forgetting a feature request about this problem and I'm wondering if you could do it. When an error occurs with the Sweave/knitr module, is it possible for LyX to catch the *real* error message in R and show it in the error dialogue box instead of just showing the very vague message "An error occured while running Rscript --verbose..."? R errors are written to stderr, so in theory it should be possible. Thanks! Regards, Yihui -- Yihui Xie <xieyi...@gmail.com> Phone: 515-294-2465 Web: http://yihui.name Department of Statistics, Iowa State University 2215 Snedecor Hall, Ames, IA [...] reply omitted [...]