Problem with Ctrl-\

[uwyang]

Combined with tree-view-open-files-updated 1.1.0.

Following are the full error:

[Enter steps to reproduce:]

1. install tree-view-open-files-updated 1.1.0

2. ctrl-
   `[Enter steps to reproduce:]

3. ...

4. ...

Atom: 1.20.0 x64
Electron: 1.6.9
OS: Ubuntu 16.04.3
Thrown From: tree-view-open-files-updated package 1.1.0

Stack Trace

Uncaught TypeError: ref.is is not a function

At /home/penpen/.atom/packages/tree-view-open-files-updated/lib/tree-view-open-files.coffee:27

TypeError: ref.is is not a function
    at /packages/tree-view-open-files-updated/lib/tree-view-open-files.coffee:27:27)
    at CommandRegistry.module.exports.CommandRegistry.handleCommandEvent (/usr/share/atom/resources/app/src/command-registry.js:265:35)
    at /usr/share/atom/resources/app/src/command-registry.js:3:65
    at KeymapManager.module.exports.KeymapManager.dispatchCommandEvent (/usr/share/atom/resources/app/node_modules/atom-keymap/lib/keymap-manager.js:621:22)
    at KeymapManager.module.exports.KeymapManager.handleKeyboardEvent (/usr/share/atom/resources/app/node_modules/atom-keymap/lib/keymap-manager.js:412:28)
    at WindowEventHandler.module.exports.WindowEventHandler.handleDocumentKeyEvent (/usr/share/atom/resources/app/src/window-event-handler.js:100:42)
    at HTMLDocument.<anonymous> (/usr/share/atom/resources/app/src/window-event-handler.js:3:65)

Commands

     -0:08.9.0 tree-view:toggle (input.hidden-input)

Non-Core Packages

atom-beautify 0.30.5 
language-babel 2.74.1 
tree-view-open-files 0.3.0 
tree-view-open-files-updated 1.1.0 

`