Update feature object's state using Rally PHP -

i'm trying update feature's state using rally php. thought code work :

connection::rally()->update('state', '7177179173', array('name' => 'in backlog'));

but giving me "not authorized" error :

fatal error: uncaught exception 'rallyapierror' message 'not authorized update: state 7177179173'

can please me this? thanks!

i able figure out. every state has different object id; "in backlog" has object id of : 7177179173.

this line of code trick:

connection::rally()->update('feature', '12848970281', array('state' => '7177179173'));

what means: update state of feature (that has object id of 12848970281) "in backlog" (that has object id of 7177179173)