{"action":"created","issue":{"url":"https://api.github.com/repos/jupyter/notebook/issues/1894","repository_url":"https://api.github.com/repos/jupyter/notebook","labels_url":"https://api.github.com/repos/jupyter/notebook/issues/1894/labels{/name}","comments_url":"https://api.github.com/repos/jupyter/notebook/issues/1894/comments","events_url":"https://api.github.com/repos/jupyter/notebook/issues/1894/events","html_url":"https://github.com/jupyter/notebook/issues/1894","id":189161245,"number":1894,"title":"Blank screen when starting notebook","user":{"login":"JCEmmons","id":4491110,"avatar_url":"https://avatars.githubusercontent.com/u/4491110?v=3","gravatar_id":"","url":"https://api.github.com/users/JCEmmons","html_url":"https://github.com/JCEmmons","followers_url":"https://api.github.com/users/JCEmmons/followers","following_url":"https://api.github.com/users/JCEmmons/following{/other_user}","gists_url":"https://api.github.com/users/JCEmmons/gists{/gist_id}","starred_url":"https://api.github.com/users/JCEmmons/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/JCEmmons/subscriptions","organizations_url":"https://api.github.com/users/JCEmmons/orgs","repos_url":"https://api.github.com/users/JCEmmons/repos","events_url":"https://api.github.com/users/JCEmmons/events{/privacy}","received_events_url":"https://api.github.com/users/JCEmmons/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":8,"created_at":"2016-11-14T16:39:42Z","updated_at":"2016-12-01T03:08:04Z","closed_at":null,"body":"When running from the latest source from github ( as of 2016-11-14 ),  when starting up the notebook, instead of the main screen, I get a blank screen.  Examination of the JS debugging info yields the error:\r\n\r\n```\r\nTypeError: root is undefined\r\nLooks to be in function function __webpack_require__(moduleId) {\r\n```\r\n\r\nIs there some piece that I am missing here that isn't documented? I've tried this on 2 different machines with the same result."},"comment":{"url":"https://api.github.com/repos/jupyter/notebook/issues/comments/264066880","html_url":"https://github.com/jupyter/notebook/issues/1894#issuecomment-264066880","issue_url":"https://api.github.com/repos/jupyter/notebook/issues/1894","id":264066880,"user":{"login":"Carreau","id":335567,"avatar_url":"https://avatars.githubusercontent.com/u/335567?v=3","gravatar_id":"","url":"https://api.github.com/users/Carreau","html_url":"https://github.com/Carreau","followers_url":"https://api.github.com/users/Carreau/followers","following_url":"https://api.github.com/users/Carreau/following{/other_user}","gists_url":"https://api.github.com/users/Carreau/gists{/gist_id}","starred_url":"https://api.github.com/users/Carreau/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/Carreau/subscriptions","organizations_url":"https://api.github.com/users/Carreau/orgs","repos_url":"https://api.github.com/users/Carreau/repos","events_url":"https://api.github.com/users/Carreau/events{/privacy}","received_events_url":"https://api.github.com/users/Carreau/received_events","type":"User","site_admin":false},"created_at":"2016-12-01T03:08:04Z","updated_at":"2016-12-01T03:08:04Z","body":"You might have a global [cache of npm modules](https://docs.npmjs.com/cli/cache), so `npm install` get the wrong version... You probably want to clean your install aggressively (pip uninstall several time to be sure) then search your hard drive for `notebook` (and `node_modules` ?) and nuke relevant things if needed.\r\n\r\nThen I would try to reinstall. But I'm baffled as to why you would get the wrong underscore version, and how that's possible, but I haven't keep up with npm in a long time. \r\n\r\n@blink1073 have you seen something similar on JupyterLab ?\r\n\r\n\r\n"}}
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