quad not appearing on launch

[charlo1998]

Hi, First of all, thanks for the project and its documentation! it's really helpful for my uni project.

I used it for a bit and modified the pid code without any problems, but when I added a sensor to the model i got some problems running it.

I tried to revert to your initial project but now when i launch it the quad doesn't appear in gazebo. Do you have any idea why this would happen?

this is what i get when i launch it:

... logging to /home/charlo1998/.ros/log/da08810e-1a18-11eb-bfae-34cff60a0d3e/roslaunch-charles-19467.log Checking log directory for disk usage. This may take a while. Press Ctrl-C to interrupt Done checking log file disk usage. Usage is <1GB.

started roslaunch server http://charles:39895/

SUMMARY

PARAMETERS

• /Kwad/joint_motor_controller/gains/joint_back_left_prop/d: 1000
• /Kwad/joint_motor_controller/gains/joint_back_left_prop/i: 1
• /Kwad/joint_motor_controller/gains/joint_back_left_prop/p: 10000
• /Kwad/joint_motor_controller/gains/joint_back_right_prop/d: 1000
• /Kwad/joint_motor_controller/gains/joint_back_right_prop/i: 1
• /Kwad/joint_motor_controller/gains/joint_back_right_prop/p: 10000
• /Kwad/joint_motor_controller/gains/joint_front_left_prop/d: 1000
• /Kwad/joint_motor_controller/gains/joint_front_left_prop/i: 1
• /Kwad/joint_motor_controller/gains/joint_front_left_prop/p: 10000
• /Kwad/joint_motor_controller/gains/joint_front_right_prop/d: 1000
• /Kwad/joint_motor_controller/gains/joint_front_right_prop/i: 1
• /Kwad/joint_motor_controller/gains/joint_front_right_prop/p: 10000
• /Kwad/joint_motor_controller/joints: ['joint_front_rig...
• /Kwad/joint_motor_controller/type: velocity_controll...
• /Kwad/joint_state_controller/publish_rate: 50
• /Kwad/joint_state_controller/type: joint_state_contr...
• /Kwad/robot_description: <?xml version="1....
• /Kwad/robot_state_publisher/publish_frequency: 5.0
• /gazebo/enable_ros_network: True
• /rosdistro: melodic
• /rosversion: 1.14.9
• /use_sim_time: True

NODES / gazebo (gazebo_ros/gzserver) gazebo_gui (gazebo_ros/gzclient) /Kwad/ control_spawner (controller_manager/spawner) robot_state_publisher (robot_state_publisher/robot_state_publisher) spawn_urdf (gazebo_ros/spawn_model)

auto-starting new master process[master]: started with pid [19480] ROS_MASTER_URI=http://localhost:11311

setting /run_id to da08810e-1a18-11eb-bfae-34cff60a0d3e process[rosout-1]: started with pid [19491] started core service [/rosout] process[gazebo-2]: started with pid [19498] process[gazebo_gui-3]: started with pid [19503] process[Kwad/spawn_urdf-4]: started with pid [19508] process[Kwad/control_spawner-5]: started with pid [19509] process[Kwad/robot_state_publisher-6]: started with pid [19510] [ WARN] [1603997961.207642796]: The root link base_link1 has an inertia specified in the URDF, but KDL does not support a root link with an inertia. As a workaround, you can add an extra dummy link to your URDF. [gazebo-2] process has died [pid 19498, exit code 255, cmd /opt/ros/melodic/lib/gazebo_ros/gzserver -e ode /home/charlo1998/danger_ws/src/fly_bot/worlds/Kwad.world __name:=gazebo __log:=/home/charlo1998/.ros/log/da08810e-1a18-11eb-bfae-34cff60a0d3e/gazebo-2.log]. log file: /home/charlo1998/.ros/log/da08810e-1a18-11eb-bfae-34cff60a0d3e/gazebo-2*.log [ INFO] [1603997961.430300347]: Finished loading Gazebo ROS API Plugin. [ INFO] [1603997961.431259197]: waitForService: Service [/gazebo_gui/set_physics_properties] has not been advertised, waiting... [INFO] [1603997961.432373, 0.000000]: Controller Spawner: Waiting for service /Kwad/controller_manager/load_controller [INFO] [1603997961.708744, 0.000000]: Loading model XML from ros parameter robot_description [INFO] [1603997961.714817, 0.000000]: Waiting for service /gazebo/spawn_urdf_model [Err] [REST.cc:205] Error in REST request

libcurl: (51) SSL: no alternative certificate subject name matches target host name 'api.ignitionfuel.org' [WARN] [1603997991.534830, 0.000000]: Controller Spawner couldn't find the expected controller_manager ROS interface. [Kwad/control_spawner-5] process has finished cleanly log file: /home/charlo1998/.ros/log/da08810e-1a18-11eb-bfae-34cff60a0d3e/Kwad-control_spawner-5*.log

[charlo1998]

I have no idea why, but restarting my computer did the thing