pexec: command not found

Have You tried accessing the binary with the full path?

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/bin/pexec - from package: pexec

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