error: 'bt_kernel_params' has no member named 'init_group'

[adithyaeraju]

I followed the same instructions given in
http://blog.richardweiss.org/2015/06/27/raspberry-pi-bitthunder.html
and
http://bitthunder.org/docs/quick-start/

When I try to make after saving the config file, I have the following error. Could you please tell me how to solve it

/*
/home/adithya/myproject/../bitthunder/os/src/bt_main.c: In function 'bt_main':
/home/adithya/myproject/../bitthunder/os/src/bt_main.c:189:17: error: 'bt_kernel_params' has no member named 'init_group'
g_kernel_params.init_group = BT_kEventGroupCreate();
^
/home/adithya/myproject/../bitthunder/.dbuild/../.dbuild/c-objects.mk:41: recipe for target '/home/adithya/myproject/build/os/src/bt_main.o' failed
make: *** [/home/adithya/myproject/build/os/src/bt_main.o] Error 1
*/