uvfconvert: 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/uvfconvert - from package: imagevis3d

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

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