Dreamview module doesn't show map

Hello, developers. I use Apollo7.0 and when I tried to use your maps, the dreamview module cannot show the map. It just kept showing "Please send car initial position and map data".
What I did is just copy the map file to /modules/map/data, and I turned on the sim-control with 'Routing', 'Planning', 'Prediction', 'Transform', 'Localization' module and I choose map 'Town02'. However, the dreamview remains black. But when I use manual_light.sh, it detects traffic light signal.
Could you help me with that? Thanks a lot.