ssh2rpd: 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/ssh2rpd - from package: root

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

On Debian possible default full paths are:

/usr/bin/ssh2rpd - from package: root-system-bin

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

Error in other languages:
ssh2rpd: bevel nie gevind nie
ssh2rpd: comandă negăsită
ssh2rpd: comando não encontrado
ssh2rpd: commande introuvable
ssh2rpd: command not found
ssh2rpd: käsku ei ole
ssh2rpd: không tìm thấy lệnh
ssh2rpd: komanda nerasta
ssh2rpd: Kommando nicht gefunden.
ssh2rpd: kommandot finns inte
ssh2rpd: komut yok
ssh2rpd: nie znaleziono polecenia
ssh2rpd: níor aimsíodh an t-ordú
ssh2rpd: no se encontró la orden
ssh2rpd: no s'ha trobat l'ordre
ssh2rpd: opdracht niet gevonden
ssh2rpd: parancs nem található
ssh2rpd: perintah tidak ditemukan
ssh2rpd: príkaz nenájdený
ssh2rpd: příkaz nenalezen
ssh2rpd: команда не найдена
ssh2rpd: командата не е открита
ssh2rpd: 命令找不到
ssh2rpd: コマンドが見つかりません