Atom.Object.defineProperty.get is deprecated.

[itaibh]

atom.workspaceView is no longer available.
In most cases you will not need the view. See the Workspace docs for
alternatives: https://atom.io/docs/api/latest/Workspace.
If you do need the view, please use atom.views.getView(atom.workspace),
which returns an HTMLElement.

Atom.Object.defineProperty.get (/usr/share/atom/resources/app/src/atom.js:53:11)
Object.activate (/home/itaibh/.atom/packages/layout-manager/lib/layout-manager.coffee:5:9)