ics-dump: 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 Debian possible default full paths are:

/usr/bin/ics-dump - from package: vpim

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

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