BackstopJS: Windows: Testing script failure with "the system can not find the path specified" console error.

I’m following the steps laid out in https://css-tricks.com/automating-css-regression-testing/

Attempting to run this on a Windows 7 Enterprise SP1 box. Both the reference gulp task (which is generating reference image files) and the test gulp task are throwing Testing script failed with code: 1 and the test page is not launching in the browser.

Here is the output from gulp test

C:\Users\bfisher1\Documents\development\myCoolProject\bower_components\BackstopJS>gulp test

BackstopJS Config loaded at location C:\Users\bfisher1\Documents\development\myCoolProject\backstop.json
[15:27:31] Using gulpfile ~\Documents\development\myCoolProject\bower_components\BackstopJS\gulpfile.js
[15:27:31] Starting 'init'...
[15:27:31] Finished 'init' after 82 μs
[15:27:31] Starting 'test'...

Running CasperJS with:  [ 'capture/genBitmaps.js' ]
The system cannot find the path specified.
The system cannot find the path specified.
[15:27:31] Finished 'test' after 233 ms
Ready event received.
CasperJS: Ready event received.
Current location is ../../index.html
CasperJS: Current location is ../../index.html
Screenshots for phone (320x480)
CasperJS: Screenshots for phone (320x480)
Ready event received.
CasperJS: Ready event received.
Current location is ../../index.html
CasperJS: Current location is ../../index.html
Screenshots for tablet_v (568x1024)
CasperJS: Screenshots for tablet_v (568x1024)
Ready event received.
CasperJS: Ready event received.
Current location is ../../index.html
CasperJS: Current location is ../../index.html
Screenshots for tablet_h (1024x768)
CasperJS: Screenshots for tablet_h (1024x768)
Comparison config file updated.
CasperJS: Comparison config file updated.

Testing script failed with code: 1

Looks like an error occured. You may want to try running `$ gulp echo`. This will echo the requested test URL output to the console. You can check this output to verify that the file requested is indeed being received in the expected format.