kincidenceeditor: 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/kincidenceeditor - from package: korganizer

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

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