URDF for Robot Modeling - Simulation screen failed


The simulation windows failed to open correctly.
I have this messages :


There is a command to do ?

Valentin LAURENT
+33 6 81 25 67 87

Hi Val,

Could you please tell the unit and the exercise you were working on?


I am on the “Unit 1: Building the Visual Robot Model with URDF”.
When I change from Unit 0 to Unit 1, I have the problem.

If I reload the simulation I have this message :


“The distant server found an error and close the connexion. Please retry or contact the administrator”

Valentin LAURENT

If I follow all the instruction in the “WARNING” section, I have this after doing this command “roslaunch simulation_gazebo main.launch” :