Hi Andrey, This is my final report about this issue.
As I could not fix things, I ended up removing all sage and sagecell and reinstalled them from scratch. Then I got AttributeError: type object 'IOLoop' has no attribute 'initialized' I learned that this is caused by a wrong version (5.0.2) of tornado. So I downgraded tornado to the version 4.3. Then voilà, the problem disappeared! I don't know how the "too advanced" version of tornado had got to be installed into sage... Some other remarks: (1) In README.md, "for building virtual machine images in contib/vm <https://github.com/sagemath/sagecell/blob/master/contrib/vm>. In particular, " --> "contrib/vm" (2) In README.md, "Of particular interest are host and username entries of the _default_config dictionary" You seem to have changed "_default_config" to "provider_info". That's it. Thank you for maintaining SageMathCell! Kwankyu -- You received this message because you are subscribed to the Google Groups "sage-cell" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/sage-cell/4f4f70bf-1cd0-4425-a5eb-fbd27a7d6182%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
