cpanp-run-perl: 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 CentOS possible default full paths are:

/usr/bin/cpanp-run-perl - from package: perl-CPANPLUS

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/cpanp-run-perl - from package: libcpanplus-perl

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

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