whisper-create: 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/whisper-create - from package: python-whisper

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

On Debian possible default full paths are:

/usr/bin/whisper-create - from package: python-whisper

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

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