Hi

   I tried opening a Comm from the kernel as described in 

http://jupyter-notebook.readthedocs.io/en/stable/comms.html

And I am getting the error

utils.js:910 Could not open comm  --  Error: Class my_comm_target not found 
in registry 
    at utils.js:874
    at new Promise (<anonymous>)
    at Object.load_class (utils.js:859)
    at CommManager.comm_open (comm.js:84)
    at i (jquery.min.js:4)
    at Kernel._handle_iopub_message (kernel.js:1223)
    at Kernel._finish_ws_message (kernel.js:1015)
    at kernel.js:1006
    at <anonymous>
(anonymous) @ utils.js:910
Promise rejected (async)
CommManager.comm_open @ comm.js:85
i @ jquery.min.js:4
Kernel._handle_iopub_message @ kernel.js:1223
Kernel._finish_ws_message @ kernel.js:1015
(anonymous) @ kernel.js:1006
Promise resolved (async)
Kernel._handle_ws_message @ kernel.js:1006
i @ jquery.min.js:4

I have have a custom javascript file called glowcomm.js that is installed 
at the location 

nbextensions/vpython_libraries/glowcomm.js

The javascript code comes from a python package called vpython that 
installs some custom javascript code to this location using

        notebook.nbextensions.install_nbextension(path = 
package_dir+"/vpython_libraries",overwrite = True,user = True,verbose = 0)


The contents of the glowcomm.js file looks like

define(["nbextensions/vpython_libraries/jquery-ui.custom.min",
        "nbextensions/vpython_libraries/glow.min"], function() {

var comm

IPython.notebook.kernel.comm_manager.register_target('my_comm_target',

What do I need to do to register "my_comm_target"  so that I don't get this 
error.

Error: Class my_comm_target not found in registry 



Thanks

John


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