popcon-stat.pl: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/share/doc/popularity-contest/examples/bin/popcon-stat.pl - from package: popularity-contest

You may install the required package with command apt-get install {package}

Error in other languages:
popcon-stat.pl: bevel nie gevind nie
popcon-stat.pl: comandă negăsită
popcon-stat.pl: comando não encontrado
popcon-stat.pl: commande introuvable
popcon-stat.pl: command not found
popcon-stat.pl: käsku ei ole
popcon-stat.pl: không tìm thấy lệnh
popcon-stat.pl: komanda nerasta
popcon-stat.pl: Kommando nicht gefunden.
popcon-stat.pl: kommandot finns inte
popcon-stat.pl: komut yok
popcon-stat.pl: nie znaleziono polecenia
popcon-stat.pl: níor aimsíodh an t-ordú
popcon-stat.pl: no se encontró la orden
popcon-stat.pl: no s'ha trobat l'ordre
popcon-stat.pl: opdracht niet gevonden
popcon-stat.pl: parancs nem található
popcon-stat.pl: perintah tidak ditemukan
popcon-stat.pl: príkaz nenájdený
popcon-stat.pl: příkaz nenalezen
popcon-stat.pl: команда не найдена
popcon-stat.pl: командата не е открита
popcon-stat.pl: 命令找不到
popcon-stat.pl: コマンドが見つかりません