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I installed nfsen it is not possible to run web interface. Error listing:
Useless use of private array in void context at /usr/local/libexec/nfsen/NfSenRRD.pm line 287.
Useless use of a constant ("--imgformat") in void context at /usr/local/libexec/nfsen/NfSenRRD.pm line 287.
Useless use of a constant ("PNG") in void context at /usr/local/libexec/nfsen/NfSenRRD.pm line 287.
Useless use of a constant ("--title") in void context at /usr/local/libexec/nfsen/NfSenRRD.pm line 287.
Useless use of a constant ("--vertical-label") in void context at /usr/local/libexec/nfsen/NfSenRRD.pm line 287.
Useless use of a constant ("--start") in void context at /usr/local/libexec/nfsen/NfSenRRD.pm line 287.
Useless use of a constant ("--end") in void context at /usr/local/libexec/nfsen/NfSenRRD.pm line 287.
Useless use of a constant ("-w") in void context at /usr/local/libexec/nfsen/NfSenRRD.pm line 287.
Useless use of a constant ("576") in void context at /usr/local/libexec/nfsen/NfSenRRD.pm line 287.
Useless use of a constant ("-h") in void context at /usr/local/libexec/nfsen/NfSenRRD.pm line 287.
Useless use of a constant ("200") in void context at /usr/local/libexec/nfsen/NfSenRRD.pm line 287.
Useless use of private array in void context at /usr/local/libexec/nfsen/NfSenRRD.pm line 287.
Useless use of string in void context at /usr/local/libexec/nfsen/NfSenRRD.pm line 287.
Useless use of string in void context at /usr/local/libexec/nfsen/NfSenRRD.pm line 287.
Useless use of string in void context at /usr/local/libexec/nfsen/NfSenRRD.pm line 287.
Useless use of string in void context at /usr/local/libexec/nfsen/NfSenRRD.pm line 287.

Thanks a lot!
EDIT: nfsen of course

I instaled nfdump and nfsen. I turned on Netflow on the web interface and I set it. However, I don't see timestamp with milliseconds trough the nfdump. Only 2019-03-16 18:22:38.000. Or I will appreciate advice how to track NAT so I can precisely assemble flow over NAT.
Thanks a lot