gazebo界面未显示书架和机器人

[WTR-Rico]

roslaunch wpr_simulation wpb_simple.launch

[bookshelft-3] process has died [pid 8128, exit code 1, cmd /opt/ros/melodic/lib/gazebo_ros/spawn_model -file /home/g/wtr/catkin_ws/src/wpr_simulation/models/bookshelft.model -x 3.0 -y 0.2 -z 0 -Y 3.14159 -urdf -model bookshelft __name:=bookshelft __log:=/home/g/.ros/log/eaf2fdfa-f0d4-11ee-b3ed-c0b6f9aafe33/bookshelft-3.log].
log file: /home/g/.ros/log/eaf2fdfa-f0d4-11ee-b3ed-c0b6f9aafe33/bookshelft-3*.log
[bottle-4] process has died [pid 8129, exit code 1, cmd /opt/ros/melodic/lib/gazebo_ros/spawn_model -file /home/g/wtr/catkin_ws/src/wpr_simulation/models/bottles/red_bottle.model -x 2.8 -y 0 -z 0.6 -Y 0 -urdf -model red_bottle __name:=bottle __log:=/home/g/.ros/log/eaf2fdfa-f0d4-11ee-b3ed-c0b6f9aafe33/bottle-4.log].
log file: /home/g/.ros/log/eaf2fdfa-f0d4-11ee-b3ed-c0b6f9aafe33/bottle-4*.log
[spawn_urdf-5] process has died [pid 8130, exit code 1, cmd /opt/ros/melodic/lib/gazebo_ros/spawn_model -file /home/g/wtr/catkin_ws/src/wpr_simulation/models/wpb_home.model -urdf -model wpb_home __name:=spawn_urdf __log:=/home/g/.ros/log/eaf2fdfa-f0d4-11ee-b3ed-c0b6f9aafe33/spawn_urdf-5.log].
log file: /home/g/.ros/log/eaf2fdfa-f0d4-11ee-b3ed-c0b6f9aafe33/spawn_urdf-5*.log