akonaditray: 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/akonaditray - from package: kdepim-runtime

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

On Debian possible default full paths are:

/usr/bin/akonaditray - from package: kdepim-runtime

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

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