Why there is no data in mavros/local_position/pose?

i want to use vision information control my drone I use mavros with px4 firmware , and i use px4.launch file, i send vision data to mavros/vision_pose/pose or mavros/vision_pose/pose_cov, the terminal shows :

[ INFO] [1469801065.372217112]: FCU: [inav] VISION estimate valid
but there is no data in mavros/local_position/pose, what is wrong with it?
thanks for any help

I have the same issue, and I really do want the answer