pbc_to_exe: 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/pbc_to_exe - from package: parrot-devel

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

On Debian possible default full paths are:

/usr/bin/pbc_to_exe - from package: parrot-devel

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

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