akonadi2xml: 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/akonadi2xml - from package: kdepim-runtime

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

On Debian possible default full paths are:

/usr/bin/akonadi2xml - from package: kdepimlibs5-dev

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

Error in other languages:
akonadi2xml: bevel nie gevind nie
akonadi2xml: comandă negăsită
akonadi2xml: comando não encontrado
akonadi2xml: commande introuvable
akonadi2xml: command not found
akonadi2xml: käsku ei ole
akonadi2xml: không tìm thấy lệnh
akonadi2xml: komanda nerasta
akonadi2xml: Kommando nicht gefunden.
akonadi2xml: kommandot finns inte
akonadi2xml: komut yok
akonadi2xml: nie znaleziono polecenia
akonadi2xml: níor aimsíodh an t-ordú
akonadi2xml: no se encontró la orden
akonadi2xml: no s'ha trobat l'ordre
akonadi2xml: opdracht niet gevonden
akonadi2xml: parancs nem található
akonadi2xml: perintah tidak ditemukan
akonadi2xml: príkaz nenájdený
akonadi2xml: příkaz nenalezen
akonadi2xml: команда не найдена
akonadi2xml: командата не е открита
akonadi2xml: 命令找不到
akonadi2xml: コマンドが見つかりません