kttsd: 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/kttsd - from package: kdeaccessibility

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

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