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Just as a backseat opinion to @Brian Gerkey's, I experienced that the non-existent obstacles/dots in the map influenced path planning with my turtlebot, especially when they are around the narrow path (robot complained that it couldn't find valid path). After I modified the .pgm file to remove those, path got calculated.

Just as a backseat opinion to @Brian Gerkey's, I experienced that the non-existent obstacles/dots in the map influenced path planning with my turtlebot, especially . Especially when they are those dots were around the narrow path (robot path, robot complained that it couldn't find valid path). plan. After I modified the .pgm file to remove those, path got calculated.those dots/clouded region, turtlebot began moving toward a given goal.