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Is the robot in front of a wall? Does the wall appear in the laser scan? I just pushed a small change that will hide the error message, but the bottom line is that your robot cannot see a wall in front of it.

Is the robot in front of a wall? Does the wall appear in the laser scan? I just pushed a small change that will hide the error message, message (it will be a day or so before this makes it into the debians), but the bottom line is that your robot cannot see a wall in front of it.