misc device question

Hello,kernelnewbies I am trying to develop a misc driver in 3.7.0 kernel. As a basis I copy and paste this code, *without any change*, http://virtlog.com/2008/03/25/linux-miscdevice-sample/ And build it. after insmod I have : [root@n miscDevice]\>ls -al /dev/mymisc crw------- 1 root root 10, 59 Dec 19 10:24 /dev/mymisc However, when trying to open this file I get: open: No such file or directory Any ideas why ? The program with which I try to open the device is simple, a few lines following here: int main() { int fd; fd = open("/dev/mymodule", O_RDONLY); if (fd == -1) { perror("open"); exit(1); } printf("open succeeded\n"); } Any ideas why this error ? rgs, Kevin