polyimport: 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/polyimport - from package: polyml

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