Having issue with slimerjs. i.e Can't able to run with engine=slimerjs.

I am able to run this framework properly with engine=phantomjs. which is mentioned in backstop.json.
but can't able to run with engine=slimerjs.

Small window gets open and closed immediately. I am following same steps as mentioned in Readme document.

I am trying this on windows 7.
and from node js or command prompt i am executing command from directory i.e "Backstop/node_modules/backstopjs " like "npm run reference" and "npm run test".

Nothing has happened.No Reference directory has created.

Could you please have any workaround or suggestion.

command logs shows

C:\Phantom\BackstopJs\node_modules\backstopjs>npm run reference

> backstopjs@1.3.5 reference C:\Phantom\BackstopJs\node_modules\backstopjs
> gulp reference

BackstopJS Config loaded at location C:\Phantom\BackstopJs\backstop.json
[15:08:18] Using gulpfile C:\Phantom\BackstopJs\node_modules\backstopjs\gulpfile.js
[15:08:18] Starting 'clean'...
bitmaps_reference was cleaned.
[15:08:18] Starting 'bless'...
[15:08:18] Finished 'bless' after 3.83 ms
[15:08:18] Finished 'clean' after 12 ms
[15:08:18] Starting 'reference'...
gulp.run() has been deprecated. Use task dependencies or gulp.watch task triggering instead.
[15:08:18] Starting 'init'...
[15:08:18] Finished 'init' after 4.45 μs
[15:08:18] Starting 'test'...

Generating reference files.

Running CasperJS with: [ 'capture/genBitmaps.js', '--engine=slimerjs' ]
[15:08:18] Finished 'test' after 11 ms
reference has run.
[15:08:18] Finished 'reference' after 14 ms

Bitmap file generation completed.

Run `$ npm run test` to generate diff report.

Start by comparing the SlimerJS setup in the README and backstop.json with the command output. Then inspect gulpfile.js and capture/genBitmaps.js around the engine invocation, and reproduce the reference command on the reported Windows setup. Done means the SlimerJS path either completes reference generation or reports a clear, actionable failure.

Written by the indexing model from the issue text.