WarpImageMultiTransform: 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/WarpImageMultiTransform - from package: ants

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