widgets support failed

[KePu-Beijing]

I have successfully built the widgets support but when testing widget by a simple IntSlider, the result was a plain IntSlider(value=0) and there was no browser opening. The Messages buffer returned the error messages in the attachement widget_error_message.txt. It seems that the kernel message had not been recognized by jupyter-widget-client.

[Qiutum]

I encountered the same error when using the jupyter with widget support and it appears that recent commits may have caused the widget support to break.

The commit https://github.com/emacs-jupyter/jupyter/commit/2b668f755ee24ab708bdddfe84788021149c0b64 remove the session slot from the client definition and resulting the error like

Jupyter: I/O subscriber error: (invalid-slot-name "#" session)