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usually the reason for message Failed to get a plan. is not related to the teb_local_planner since it means that even the global planner cannot find a plan. This happens if the goal is not reachable or if it is located inside an obstacle. It also occurs if the robot by itself is not collision free. Here you should verify your costmap footprint.

If only the teb_local_planner cannot find a valid plan, the error message is differently:

TebLocalPlannerROS: trajectory is not feasible. Resetting planner...

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