Testing Sagemath for windows 8.0 with jmol, I get the message at the console but nothing happens. However the jmol viewer (launched with jmol.bat) found in C:\Program Files\SageMath 8.0\runtime\opt\sagemath-8.0\local\share\jmol is working correctly.
> sage: G=sphere((0,0,0),1)
> sage: show(G,figsize=(5,5),title="Sample Figure",aspect_ratio=1);
> Launched jmol viewer for Graphics3d Object
> sage:
It looks like a path problem but I don't see how to modify it.