Basically if you see a similar output as the attached the problem should be in the data passed to the command.
I just installed it on a Splunk 6.5, no config at all on a CentOS 6.5, and it works.
So, I went ahead and validated this. In a new install of splunk, I added the app and it all worked exactly as described.
I'm still reviewing the sample you gave me to validate if this is an issue with your install (permissions or something) or the data itself. In parallel, I'd appreciate if you can let me know the results of running this command on a clean install of splunk.
Did a webex and it looks like the app that was previously downloaded might have been no good. A new download from splunkbase appears to work. Waiting to hear if things go well once change windows open up...