Entity pushed to spawn queue but does not spawn in simulation

Course Support URDF for Robot Modeling
1

I’m having an issue with section 1.4 Spawn into Simulation. I have run the following command:

roslaunch my_mira_description spawn_mira_simple_collisions_inertias.launch

and I get the following output:

SpawnModel script started
[INFO] [1574821021.621107, 0.000000]: Loading model XML from ros parameter
[INFO] [1574821021.626993, 0.000000]: Waiting for service /gazebo/spawn_urdf_model
[INFO] [1574821021.632816, 0.000000]: Calling service /gazebo/spawn_urdf_model
[INFO] [1574821031.661599, 1138.582000]: Spawn status: SpawnModel: Entity pushed to spawn queue, but spawn service timed out waiting for entity to appear in simulation under the name mira
[urdf_spawner-1] process has finished cleanly
log file: /home/user/.ros/log/570d7002-10b9-11ea-8362-02a0146fd3d7/urdf_spawner-1*.log
all processes on machine have died, roslaunch will exit
shutting down processing monitor...
... shutting down processing monitor complete

The model never appears in Gazebo. I have tried resetting the simulation but I still get the same output. Any help would be appreciated.

2

Hello @acis.ubc,

May you send me your package/s so that I can check if there’s something wrong? You can send them to aezquerro@theconstructsim.com

Best,

3

Hello ,
I too have the same issue. I have been trying to figure it out for a whole day. Should I send in my package/s too?

4

Could you send us the files? duckfrost@theconstructsim.com. Also the command that you use to reproduce this issue and the unit where this happens. Thanks

5

I also had this problem @staff how can I solve this issue?

Thaks in advance

6

Hello Mr.Frost,

Wanted to know if the issue had been resolved. Eager to finish the lesson. Please do inform us when the problem has been resolved.
Sincerely,
Pravesh K Pradhan

7

Hello @pravesh.pradhan I also had this issue. And it may be not the most clever answer for you. But I tried to execute the command in the other day, without changing nothing…and it worked! And yes, I have refreshed and returned the for the first lesson of the course to refresh the system. The hint I could give is…refresh the system returning to the first lesson, pressing F5 to update the system, removing gazebo meshes and adding again, etc…or even log and unlog the site…
I hope be useful, for my case this worked…

8

Hello @marcusvini178 I will try it out. Thank you for reaching out.

9

Anyone had any luck solving this ?

10

OK - here we are a year later. I’m having the exact same issue. I don’t see a solution other than trying over and over again. I’ve tried resetting the simulation, but get the same result.

Course support - is there something I need to do, or does this have to be fixed on your end?

Thanks,
/K

11

I tried the course version of the file from the solutions. That actually spawned just fine. So it must have been an error in my URDF file. Unfortunately I accidently copied over my version, so I won’t be able to sort out where the error was. But for other students - if you get this error, try checking your URDF against the solutions version.
/K

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