Dear Daniel, thank you for your suggestions to solve the error on demo(clinton). I checked that: 1) Python is installed before R and in the path - when I type "python" on the command line, it starts running 2) My version of Python is 2.7.5 Yet, running the demo in RStudio (0.97.551) and R (3.0.2) I still get the error: demo(clinton) ---- ~~~~~~~ Type <Return> to start : [1] "python 'C:/Users/Borghetto/Documents/R/win-library/3.0/ReadMe/makerfile' --alphanumeric-only --separator \",\" --control-file 'control.txt' --table-file 'tablefile.txt' --threshold 0.01" C:\Python27\python.exe: can't open file ''C:/Users/Borghetto/Documents/R/win-library/3.0/ReadMe/makerfile'': [Errno 22] Invalid argument Error in undergrad(sep = ",") : Python module failed. Aborting undergrad. In addition: Warning message: running command 'python 'C:/Users/Borghetto/Documents/R/win-library/3.0/ReadMe/makerfile' --alphanumeric-only --separator "," --control-file 'control.txt' --table-file 'tablefile.txt' --threshold 0.01' had status 2 Any idea? Thanks a lot Enrico -- Enrico Borghetto, PhD Post-Doctoral Fellow Cesnova - Centro de Estudos de Sociologia da Universidade Nova de Lisboa NOVA University of Lisbon Personal Website <http://enricoborghetto.weebly.com/> Italian Policy Agendas <http://italianpolicyagendas.weebly.com/> Center for the Observation of Legislatures <http://www.coolresearch.net/> Italian Law Making Archive <http://159.149.130.120/ilma/sito/>