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robot_pose_ekf problem

I'm trying to use robot_pose_ekf with an IMU and odometry, but I'm getting the error "filter time older than odom message buffer" . Echoing data from the two topics, the time stamps are the same for both IMU and odometry topics. Odometry data is being redirected from its original topic "/RosAria/pose" to the topic "odom" using the line

<remap from="/odom" to="/RosAria/pose"/>

in the robot_pose_ekf launch file. Has anyone experienced this problem before?