config and setup NTOP

Hi

I am new to CLearOS and Linux and im trying to get NTOP up and running so that it captures my network activity.
Hi have installed NTOP and is able to log in but it does not seem to to keep history of the network usage there is usage on my IP but no breakdown.

I do get the following message when trying to view my history " File /var/tmp/ntopng/1/rrd/all cannot be found "

Does NTOP use NPROBE?
Does NPROBE need to be installed as well?

Any detailed guides available?

Thanks