seewbmp: 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/seewbmp - from package: kannel

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

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