Erlang sellaprime OTP application - erlang

Question

I'm trying to run the sellaprime example OTP application from Chapter 23 of Programming Erlang 2nd Ed. I have uploaded the code to https://github.com/myles-mcdonnell/sellaprime
After compiling with rebar I run erl from the root, then switch dir ..
1> c(src).
/Users/mylesmcdonnell/sellaprime/src
ok
then I load the app..
2> application:load(sellaprime).
ok
then I try to start the app..
3> application:start(sellaprime).
=CRASH REPORT==== 5-Feb-2015::09:55:34 ===
crasher:
initial call: application_master:init/4
pid: <0.48.0>
registered_name: []
exception exit: {bad_return,
{{sellaprime_app,start,[normal,[]]},
{'EXIT',
{undef,
[{sellaprime_app,start,[normal,[]],[]},
{application_master,start_supervisor,3,
[{file,"application_master.erl"},
{line,326}]},
{application_master,start_the_app,5,
[{file,"application_master.erl"},
{line,308}]},
{application_master,start_it_new,7,
[{file,"application_master.erl"},
{line,294}]}]}}}}
in function application_master:init/4 (application_master.erl, line 133)
ancestors: [<0.47.0>]
messages: [{'EXIT',<0.49.0>,normal}]
links: [<0.47.0>,<0.7.0>]
dictionary: []
trap_exit: true
status: running
heap_size: 610
stack_size: 27
reductions: 124
neighbours:
=INFO REPORT==== 5-Feb-2015::09:55:34 ===
application: sellaprime
exited: {bad_return,
{{sellaprime_app,start,[normal,[]]},
{'EXIT',
{undef,
[{sellaprime_app,start,[normal,[]],[]},
{application_master,start_supervisor,3,
[{file,"application_master.erl"},{line,326}]},
{application_master,start_the_app,5,
[{file,"application_master.erl"},{line,308}]},
{application_master,start_it_new,7,
[{file,"application_master.erl"},
{line,294}]}]}}}}
type: temporary
{error,
{bad_return,
{{sellaprime_app,start,[normal,[]]},
{'EXIT',
{undef,
[{sellaprime_app,start,[normal,[]],[]},
{application_master,start_supervisor,3,
[{file,"application_master.erl"},{line,326}]},
{application_master,start_the_app,5,
[{file,"application_master.erl"},{line,308}]},
{application_master,start_it_new,7,
[{file,"application_master.erl"},{line,294}]}]}}}}}
Clearly something is undefined but I'm struggling to determine what? I have lifted the code directly from the book download site with no changes.