pymcaroitool: 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 Debian possible default full paths are:

/usr/bin/pymcaroitool - from package: pymca

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

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