pycardsyncer: 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/pycardsyncer - from package: pycarddav

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

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