iterative_shape_averaging: 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

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/lib/cmtk/bin/iterative_shape_averaging - from package: cmtk

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