Problem with sr_hand launch file

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Hi,

I'm trying to execute launch file of sr_hand package:

roslaunch sr_hand sr_arm_motor.launch

but since, I think, I updated, always I get an error:

core service [/rosout] found
process[shadowarm-1]: started with pid [3961]
process[robot_state_publisher_pos_arm-2]: started with pid [3962]
process[robot_state_publisher_target_arm-3]: started with pid [3963]
process[shadowhand-4]: started with pid [3964]
process[srh_robot_state_publisher_pos-5]: started with pid [3965]
process[srh_robot_state_publisher_target-6]: started with pid [3966]
process[fixed_frame_pos_pub_arm-7]: started with pid [3968]
process[fixed_frame_target_pub_arm-8]: started with pid [3978]
process[link_hand_arm_pos-9]: started with pid [3984]
process[link_hand_arm_target-10]: started with pid [3989]
process[ordered_position_joint_states_merger-11]: started with pid [3994]
process[ordered_target_joint_states_merger-12]: started with pid [4003]
process[sr_diagnostic_aggregator-13]: started with pid [4010]
[ERROR] [1330675983.196615526]: [registerPublisher] Failed to contact master at
 [localhost:11311].  Retrying...

Never contact with master and I don't know why happen this because master should be active. I try execute roscore but obviously don't work because sr_arm_motor.launch try to launch its own master.

Update: Also, I try to follow next tutorial (http://www.ros.org/wiki/sr_hand/Tutorials/Getting%20Started%3A%20running%20the%20hand%20and%20arm%20interface) but nothing work. Always I receive once of this errors:

[ERROR] [1330682782.955981987]: [registerPublisher] Failed to contact master at
 [localhost:11311].  Retrying...

or

cannot resolve host address for machine [napoleon]

If someone can help me, I appreciate.

Thanks.

Raúl Pérula