ImageSimilarity is not a function

[nickabocker171]

following the steps to steps and issuing the command NPM Start returns error "TypeError: CV.ImageSimilarity is not a function
at CV.readImage (/home/pi/camera/security-camera.js:116:12)
at RaspiCam. (/home/pi/camera/security-camera.js:113:8)
at RaspiCam.emit (events.js:198:13)
at FSWatcher. (/home/pi/camera/node_modules/raspicam/lib/raspicam.js:196:14)
at FSWatcher.emit (events.js:198:13)
at FSEvent.FSWatcher._handle.onchange (internal/fs/watchers.js:131:12)"