Upload error without any diagnostic output

[cbowns]

% ± make run
./node_modules/coffee-script/bin/coffee Main.coffee
Please enter your slack details:
prompt: Enter your slack domain or company name:  co-name
prompt: email:  user@domain
prompt: Enter your password (will be hidden):  
Result:

error: Error: Command failed: ./node_modules/casperjs/bin/casperjs --ssl-protocol=any --engine=slimerjs /Users/cbowns/Development/crlf/slack/Slekkel/Scrape.coffee co-name user@domain password /Users/cbowns/Development/crlf/slack/Slekkel/emoji_to_upload/allthethings.png …
../Users/cbowns/Development/crlf/slack/Slekkel/emoji_to_upload/zoidberg.png.../Users/cbowns/Development/crlf/slack/Slekkel/emoji_to_upload/zzz.gif

Where should I begin to debug this? The tool doesn't set an exit status and doesn't log anything about what went wrong.

[eightfivezero]

+1

I get the same non-descriptive error.