Turtlebot failure with has_gyro=false

edit

I am using Irobot create with kinect to work like turtlebot; I do not have gyro, so i edited driver.launch to has_gyro=false; after editing i tried turtlebot_bringup again but it did not detect roomba, Roomba was connected and turned on I doublechecked it

the log was

[INFO] [WallTime: 1310523346.309227] has gyro: False
Failed to contact device with error: ['NoneType' object has no attribute 'cal_offset']. Please check that the Create is powered on and that the connector is plugged into the Create.
[turtlebot_node-3] process has finished cleanly.
log file: /home/sunny/.ros/log/d7eb1944-acf0-11e0-9460-00238bc1b481/turtlebot_node-3*.log
respawning...
[turtlebot_node-3] restarting process
process[turtlebot_node-3]: started with pid [12885]
[INFO] [WallTime: 1310523354.583950] serial port: /dev/ttyUSB0
[INFO] [WallTime: 1310523354.584284] update_rate: 30.0
[INFO] [WallTime: 1310523354.584518] drive mode: twist
[INFO] [WallTime: 1310523354.584767] has gyro: False

and log file says

[rospy.impl.masterslave][INFO] 2011-07-13 11:22:03,114: atexit
[rospy.client][INFO] 2011-07-13 11:22:07,315: init_node, name[/turtlebot_node], pid[15862]
[xmlrpc][INFO] 2011-07-13 11:22:07,331: XML-RPC server binding to 0.0.0.0
[rospy.init][INFO] 2011-07-13 11:22:07,332: ROS Slave URI: [http://163.221.84.203:44864/]
[xmlrpc][INFO] 2011-07-13 11:22:07,332: Started XML-RPC server [http://163.221.84.203:44864/]
[rospy.impl.masterslave][INFO] 2011-07-13 11:22:07,332: _ready: http://163.221.84.203:44864/
[xmlrpc][INFO] 2011-07-13 11:22:07,339: xml rpc node: starting XML-RPC server
[rospy.registration][INFO] 2011-07-13 11:22:07,371: Registering with master node http://163.221.84.203:11311
[rospy.init][INFO] 2011-07-13 11:22:07,433: registered with master
[rospy.rosout][INFO] 2011-07-13 11:22:07,433: initializing /rosout core topic
[rospy.rosout][INFO] 2011-07-13 11:22:07,481: connected to core topic /rosout
[rospy.simtime][INFO] 2011-07-13 11:22:07,504: /use_sim_time is not set, will not subscribe to simulated time [/clock] topic
[rosout][INFO] 2011-07-13 11:22:07,662: serial port: /dev/ttyUSB0
[rosout][INFO] 2011-07-13 11:22:07,663: update_rate: 30.0
[rosout][INFO] 2011-07-13 11:22:07,663: drive mode: twist
[rosout][INFO] 2011-07-13 11:22:07,663: has gyro: False
[root][INFO] 2011-07-13 11:22:10,078: sending control opcodes.
[rospy.core][INFO] 2011-07-13 11:22:11,623: signal_shutdown [atexit]
[rospy.impl.masterslave][INFO] 2011-07-13 11:22:11,642: atexit

What is the problem?