Could you tell us how you're demonstrating Xcos demos? Is it from Xcos preloaded demos? Are you running your own demos? If you see any error, please copy and paste it here. Which Arduino site are you referring to?
yes i am running the demos provided for Xcos from software.preloaded. also i am reffering to Scilab-arduino icon on fossee site. whenever i open it i get error.i have attached screenshots of both the issues .please check whether they are attached.