I'm observing this error while running the below flent command 

flent rrul -l 180 -H netperf.bufferbloat.net

Runner Ping (ms) ICMP failed check: Cannot parse output of the system ping binary (/sbin/ping). Please install fping v3.5+.
Starting Flent 2.0.1 using Python 3.8.2.

which fping 
/usr/local/bin/fping
 
fping -v 
fping: Version 4.2
fping: comments to david@schweikert.ch

Any suggestions ? 

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