Problem with move_base when reaching the goal

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Hi,

I am using the navigation stack of ros for a differential wheeled robot. Everything seems to work well but recently when I send a navigation goal to rviz, when the robot gets close to the goal area I get many of these warnings :

WARN: DWA planner failed to produce path. : Got new plan WARN : Off Map 3.041686, 2.039254

The costmap seems ok and the path is clear and the map has successfully always worked like this. I have created the map with gmapping.

I dont know what is the reason for this. Thanks in advance for your help.