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[gnestor]

This appears to be a regression in 4.2 or 4.2.1. Possibly related to 11bd42c.

https://github.com/jupyter/notebook/blob/master/notebook/static/edit/js/main.js#L46

 ReferenceError: contents is not defined     require.js?v=6da8be3…:900
    at main.js:46
    at Object.execCb (require.js?v=6da8be3…:1690)
    at Module.check (require.js?v=6da8be3…:865)
    at Module.<anonymous> (require.js?v=6da8be3…:1140)
    at require.js?v=6da8be3…:131
    at require.js?v=6da8be3…:1190
    at each (require.js?v=6da8be3…:56)
    at Module.emit (require.js?v=6da8be3…:1189)
    at Module.check (require.js?v=6da8be3…:940)
    at Module.enable (require.js?v=6da8be3…:1177)

[minrk]

That commit makes sense that it could cause such an error, but it wouldn't affect 4.2, since that commit is only in master. Can you see this error in a 4.2 release?

[gnestor]

Yes, I only see this is master. I tried the 4.2 branch and it works as expected.

[minrk]

Mark as 5.0, not 4.3, then?

[minrk]

#2073 ought to do it.