How to enable pinmux configuration in Beagle bone linux kernel 3.8

Hi All,
I am trying to config the pins in beagle bone linux kernel 3.8 through a command “config-pin p8.11 gpio” but it gives as follows:
P8_11 pinmux file not found!
cape-universala overlay not found.
run “config-pin overlay cape-universala” to load the cape.
But when I ran “config-pin overlay cape-universala” command it gave error as:
“failed to load firmware cape-universala-00A0.dtbo
Error loading device tree overlay file:cape-universala”.
I request everyone to please help me to resolve the issue.
Thanks and regards,
Imran.