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No ealier segments error. Gazebo 1.3

I am implementing gazebo-1.3 to ros-plugin for PR2.

Now, Robot moves well, but my contact sensor plugin does not countinuously give collision ros-topics like collision gazebo-topic (gztopic).

I confirmed error message from launched terminal. I found following error message.

[ERROR] [1358114072.409449185]: No ealier segments. First segment starts at 27.536 (now=27.534)

I could not find which plugin gives this error, but after appearing this message, my contact plugin does not publish any topics.

Is there any body knows the meaning of error message?

Thanks

No ealier segments error. Gazebo 1.3

I am implementing gazebo-1.3 to ros-plugin for PR2.

Now, Robot PR2 moves well, but my contact sensor plugin does not countinuously give collision ros-topics collision-rostopic like collision gazebo-topic (gztopic).collision-gztopic.

I confirmed found following error message from launched terminal. I found following error message.terminal.

[ERROR] [1358114072.409449185]: No ealier segments. First segment starts at 27.536 (now=27.534)

I could not find which plugin gives this error, but after appearing this message, my contact plugin does not publish any topics.

Is there any body anybody knows the meaning of this error message?

Thanks