This is an error report.
Screenshot of the error
Error details
This is Intermediate ROS2 Course, so far the simulation of Unit 1, 2 and 3 keeps on loading. I have a stable connection so internet speed may not be an issue. Please let me know if there's any update on this matter as I am unable to use the simulation now. Thanks very much for your help!
Anyone can help? The simulation doesn’t seem to be working for the entire course.
Looking into this right now @dansyw91.
I apologize for the delay.
I have just tried loading the course and can see the simulation properly. Perhaps something in your browser/PC/connection is blocking the simulation (yes, it does happen!).
Things you can check:
ws:// or wss://, in addition to http and https? We use WebSocket extensively for those screens. You can check whether WebSocket is working here: websocket .A quick troubleshooting step would be trying another browser (we support Chrome, Edge, and Firefox), an Internet connection, or a PC you have not tried before.
Hi Sir, here’s my responses:
Is your browser in incognito or private mode (or some other limited mode)?
I was not in incognito mode.
Does your network allow WebSocket connections, ws:// or wss://, in addition to http and https? We use WebSocket extensively for those screens. You can check whether WebSocket is working here: websocket .
Just checked, it is echoing.
Is third-party JavaScript enabled for your browser?
I’m not quite sure, but the simulations in other courses work fine with the same browser.
Are you using an AdBlock or some strict Internet Security suite?
No I didn’t use any AdBlock. Even when I used Opera which has AdBlock auto-enabled, it still worked fine in other courses.
Are you behind a VPN/Firewall?
No I’m not using VPN/Firewall.
A quick troubleshooting step would be trying another browser (we support Chrome, Edge, and Firefox), an Internet connection, or a PC you have not tried before.
I’m using Firefox with stable internet.
If it worked fine on other courses, then it should work fine for this also.
Could you please try again and wait a bit more this time for the simulation to appear? It should appears, because it does appear for other courses and appears for me and others.
Thanks for your response.
I have been on this course for more than four days on Firefox. It’s just the same every time I load it. I also just tried on Edge, unfortunately it was still loading after waited for 15 minutes.
Any other possible causes?
Yes, the only other cause I can think of right now is if you (accidentally) modified the ROS environment variables in your ~/.bashrc file.
Could you please share below the contents of that file, so we can check if something has changed.
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