Open atom using the Cmd + Space and type atom or form Launchpad
Cmd + Shift + P for command window and type "Omnisharp Atom: New Project" OR Packages menu > OmniSharp > New Project.
When finder windows pops up, press Esc or cancel button to exit out of finder and this error happened.
Atom Version: 1.1.0
System: Mac OS X 10.11.1
Thrown From: atom-yeoman package, v0.3.15
Stack Trace
Uncaught TypeError: Cannot read property 'length' of null
At /Applications/Atom.app/Contents/Resources/app.asar/src/project.js:210
TypeError: Cannot read property 'length' of null
at Project.module.exports.Project.setPaths (/Applications/Atom.app/Contents/Resources/app.asar/src/project.js:210:41)
at /Users/spuli/.atom/packages/atom-yeoman/lib/generator.js:127:38
at EventEmitter.<anonymous> (/Applications/Atom.app/Contents/Resources/app.asar/src/atom.js:400:16)
at emitOne (events.js:77:13)
at EventEmitter.emit (events.js:169:7)
Atom Version: 1.1.0 System: Mac OS X 10.11.1 Thrown From: atom-yeoman package, v0.3.15
Stack Trace
Uncaught TypeError: Cannot read property 'length' of null
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