We entered in the URL and Crontab fields, but are not able to save it. I downloaded casper.js and phatom.js and placed it in the Splunk app folder
It looks to me like there are no spaces between the asterisk characters?
ie it looks like "1*****" when it should be "1 * * * * *". This wouldn't explain why the client is not displaying any helpful error to that effect so perhaps it's not the only problem.