Uncaught TypeError: undefined is not a function

[NerdcoreSteve]

[Enter steps to reproduce below:]

1. ...
2. ...

Atom Version: 1.0.0
System: Mac OS X 10.10.2
Thrown From: tail package, v0.1.0

Stack Trace

Uncaught TypeError: undefined is not a function

At /Users/admin/.atom/packages/tail/lib/tail.coffee:38

TypeError: undefined is not a function
  at Object.module.exports.Tail.toggle (/Users/admin/.atom/packages/tail/lib/tail.coffee:38:38)
  at atom-workspace.<anonymous> (/Users/admin/.atom/packages/tail/lib/tail.coffee:15:60)
  at CommandRegistry.module.exports.CommandRegistry.handleCommandEvent (/Applications/Atom.app/Contents/Resources/app.asar/src/command-registry.js:241:29)
  at CommandRegistry.handleCommandEvent (/Applications/Atom.app/Contents/Resources/app.asar/src/command-registry.js:3:61)
  at CommandRegistry.module.exports.CommandRegistry.dispatch (/Applications/Atom.app/Contents/Resources/app.asar/src/command-registry.js:156:19)
  at EventEmitter.<anonymous> (/Applications/Atom.app/Contents/Resources/app.asar/src/window-event-handler.js:70:30)
  at emitOne (events.js:77:13)
  at EventEmitter.emit (events.js:166:7)

Commands

 31x -9:08.1.0 core:move-left (atom-text-editor.editor.is-focused)
  2x -3:33.8.0 core:confirm (atom-text-editor.editor.mini.is-focused)
  3x -3:12.8.0 core:backspace (atom-text-editor.editor.mini.is-focused)
  9x -3:07.6.0 core:confirm (atom-text-editor.editor.mini.is-focused)
  8x -1:51.3.0 core:backspace (atom-text-editor.editor.mini.is-focused)
     -0:00.7.0 tail:toggle (div.settings-view.pane-item)

Config

{
  "core": {
    "themes": [
      "atom-dark-ui",
      "solarized-dark-syntax"
    ]
  }
}

Installed Packages

# User
tail, v0.1.0

# Dev
No dev packages