Carla Digital Twin Tool :Error during using the tool in CarlaToolContent

[yuxuansun413]

CARLA version:0.9.15

Platform/OS:Ubuntu20.04

When I finally use the tool'UW_OnroadMainWidget' in CarlaToolContent and paste the path to the folder,which generated from my osm file and build.sh ,and run the generate file , there is no display or preview of the region.
After clicking the generate,the generated map is blank.
But when i click two zoom buttons,terminal has some reaction.

I hope the 2Dview of the region will display and let me check and choose

Thank you for the time