turtlebot navigation goal initializing problem

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Hi, I'm new on ros and I was trying to make turtlebot exploring package. I used explore_lite package (http://wiki.ros.org/explore_lite) but modified the way of setting goal for exploration. I got a problem while simulating in turtlebot world. Debug messages shown below came out in terminal, goal was initialize and turtlebot bumped to obstacle. Can anyone please tell me why these debug is happening and how can I fix it? I found out that some of debugs are from actionlib.