After installing in Mac OS web server don't start

[karachay]

I just installed Splunk 8.0.0 version in my Mac and the terminal show this

Waiting for web server at
http://127.0.0.1:8000 to be
available............................................................................................................................................................................................................................................................................................................

WARNING: web interface does not seem
to be available!

Any advice would be welcome, I'm trying to get done the Fundamentals part 1