F5 WAF Tester fails to execute. (ValueError: No JSON object could be decoded)

Version Installed: f5-waf-tester 0.1.1b

Commands run:

f5-waf-tester

f5-waf-tester -c /home/waftester/config.json -t /home/waftester/tests.json -r /home/waftester/report.json

Tool fails to run, resulting in the error below. 

File "/usr/lib64/python2.7/json/decoder.py", line 384, in raw_decode

  raise ValueError("No JSON object could be decoded")

ValueError: No JSON object could be decoded

Also I tried f5-waf-tester --init and f5-waf-tester ... with no options - came back with same result as above

Thanks,

Tony