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I can confirm that the error occurs on OS X when trying to save a JSmol image from a Sage notebook. Sage notebooks are no longer actively developed so that error won't go away any time soon.

There is another type of notebook, a Jupyter notebook, but the JSmol context menu doesn't appear to function properly in that notebook so that's not much help.

One workaround is to not start the notebook, but enter your code at the Sage command line. That launches the Java version Jmol. Saving images from the Java version works for me on OS X El Capitan.

Another option is to go to http://sagecell.sagemath.org and enter your code there. Saving JSmol images works there as well, because that functionality has recently been updated.

I can confirm that the error occurs on OS X / Safari when trying to save a JSmol image from a Sage notebook. Sage notebooks are no longer actively developed so that error won't go away any time soon.

If you want to use a notebook anyway, try using a different browser. The location of the notebooks by default is http://localhost:8080/home/admin/, and you'll need the password you created when you first started a notebook. Saving images works for me with Firefox as the browser displaying the notebook.

There is another type of notebook, a Jupyter notebook, but the JSmol context menu doesn't appear to function properly for that notebook type in that notebook Safari or Firefox so that's not much help.

One workaround is to not start the notebook, but enter your code at the Sage command line. That launches the Java version Jmol. Saving images from the Java version works for me on OS X El Capitan.

Another option is to go to http://sagecell.sagemath.org and enter your code there. Saving JSmol images works there as well, because that functionality has recently been updated.