Hello,
Now I'm fallowing the book example of Corobot Simulation part from the scratch.
I barely can write everything related corobot entity and
simulatedquaddifferentialdrive services which means that I'm on
page 310 of the book.
I tried to run both robot and quad differential drive services with simple dashboard by running the manifest, but it never works and the console gave me bunch of red error messages.
Hope you guys can see the console message below.
<img src="http://lh6.ggpht.com/kyuhyong/SI5Jiw_UBtI/AAAAAAAAAPY/AmwI0gEXg8E/error2.png?imgmax=512">
if not working, please copy this link and paste on the address line.
http://lh6.ggpht.com/kyuhyong/SI5Jiw...png?imgmax=512

I can guess that the quadDifferentialdrive service should be included in the VPL but it isn't. I simply can't see the service with the same name in the service list.
Thanks for looking at my question,

I had a look at the error messages (they do not show up in the posting) but I have not seen that error before.

I suspect that there is a typographical mistake somewhere in the manifest, but I can't be sure.

Can you please try running the Corobot sample from the book? If that works, then you can do a differences and see what you might have wrong.

Trevor