weathermap4rrd: 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/weathermap4rrd - from package: weathermap4rrd

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

Error in other languages:
weathermap4rrd: bevel nie gevind nie
weathermap4rrd: comandă negăsită
weathermap4rrd: comando não encontrado
weathermap4rrd: commande introuvable
weathermap4rrd: command not found
weathermap4rrd: käsku ei ole
weathermap4rrd: không tìm thấy lệnh
weathermap4rrd: komanda nerasta
weathermap4rrd: Kommando nicht gefunden.
weathermap4rrd: kommandot finns inte
weathermap4rrd: komut yok
weathermap4rrd: nie znaleziono polecenia
weathermap4rrd: níor aimsíodh an t-ordú
weathermap4rrd: no se encontró la orden
weathermap4rrd: no s'ha trobat l'ordre
weathermap4rrd: opdracht niet gevonden
weathermap4rrd: parancs nem található
weathermap4rrd: perintah tidak ditemukan
weathermap4rrd: príkaz nenájdený
weathermap4rrd: příkaz nenalezen
weathermap4rrd: команда не найдена
weathermap4rrd: командата не е открита
weathermap4rrd: 命令找不到
weathermap4rrd: コマンドが見つかりません