TaskJugglerUI: 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/TaskJugglerUI - from package: taskjuggler

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

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