costmap_2d 错误

运行指定区域建图命令:
roslaunch ailibot_slam frontier_exploration.launch
错误信息:
[ WARN] [1565591858.913845757]: Costmap2DROS transform timeout. Current time: 1565591858.9138, global_pose stamp: 1565591858.3790, tolerance: 0.5000

[ WARN] [1565591858.913882120]: Could not get robot pose, cancelling reconfiguration

[ WARN] [1565592060.058385604]: Illegal bounds change, was [tl: (-49.975000, -49.975000), br: (49.225001, 49.225001)], but is now [tl: (-50.000000, -50.000000), br: (49.175001, 49.175001)]. The offending layer is explore_costmap/explore_boundary
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