search for: ppp_output_wakeup_rcb5deb89

hi, i got he following error while trying to install digium cards in red hat linux 7.3. please help. [root@localhost root]# modprobe zaptel lib/modules/2.4.18-3bigmem/misc/zaptel.o: unresolved symbol cpu_raise_softirq_Rd01f3ee8 lib/modules/2.4.18-3bigmem/misc/zaptel.o: unresolved symbol ppp_output_wakeup_Rcb5deb89 lib/modules/2.4.18-3bigmem/misc/zaptel.o: unresolved symbol register_chrdev_R8fd899d1 lib/modules/2.4.18-3bigmem/misc/zaptel.o: unresolved symbol alloc_skb_R165836f4 lib/modules/2.4.18-3bigmem/misc/zaptel.o: unresolved symbol __pollwait_R6023e4d1 lib/modules/2.4.18-3bigmem/misc/zaptel.o: unresolved...