I need sound

[Adrian Pop <apop302 quantum physics uvt ro>]

 Does anyone knows what this error means:
' unresolved symbols in /lib/modules/..../driver/sound/filename.o '( there
are like 10 mesages like this , for every file in this folder)
I get this mesage at every startup after installing alsa. Of course I have
no sound, and i really need it!