kobuki:Timed out while waiting for serial data stream [/mobile_base]

[talugirl]

I met this problem with turtlebot2.The problem as follows
process[cmd_vel_mux-5]: started with pid [22201]
process[bumper2pointcloud-6]: started with pid [22232]
process[turtlebot_laptop_battery-7]: started with pid [22272]
process[capability_server-8]: started with pid [22309]
process[app_manager-9]: started with pid [22354]
process[master-10]: started with pid [22386]
process[interactions-11]: started with pid [22414]
[WARN] [WallTime: 946688121.248983] Battery : unable to check laptop battery info [/sys/class/power_supply/test_battery/capacity/charge_full_design || /sys/class/power_supply/test_battery/capacity/energy_full_design does not exist]
[ERROR] [946688121.441884000]: Failed to find nodelet with name '/cmd_vel_mux' to unload.
[ERROR] [946688122.043322000]: Kobuki : Timed out while waiting for serial data stream [/mobile_base].
[turtlebot_laptop_battery-7] process has finished cleanly
log file: /data/.ros/log/115f57b3-bfe1-11d3-941a-3d8cea6db6a9/turtlebot_laptop_battery-7*.log
[ERROR] [946688122.943510000]: Kobuki : Timed out while waiting for serial data stream [/mobile_base].

[chendongcse]

+1.The same peoblem