According to the error message, you need to create the
device file
/dev/dsp (a special file that interfaces with your sound card) for your sound card to work...
Unfortunately I have
no idea how to do that... You may have to research on your own (
www.linuxdoc.org). Read the
man page for mknod. I've checked my system, and it seems like it's a
character device with the major number 14 and minor number 3. This may be different for your system.