navfn unable to create path

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Due to the false local costmaps on the way of robot, navfn is unable to create a global path to its goal. Here is the scrrenshot:

In this kind of situation how should the robot solve this condition? For this i was planning to use /move_base/clear_costmaps service request from client node so that the false costmaps will be removed, but i also found that this will also clear all the local costmaps including the ture costmaps in map.