ksverdiff: 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 CentOS possible default full paths are:

/usr/bin/ksverdiff - from package: pykickstart

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/ksverdiff - from package: python-pykickstart

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

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