vnc2swf: 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 CentOS possible default full paths are:

/usr/bin/vnc2swf - from package: pyvnc2swf

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/vnc2swf - from package: pyvnc2swf

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

Error in other languages:
vnc2swf: bevel nie gevind nie
vnc2swf: comandă negăsită
vnc2swf: comando não encontrado
vnc2swf: commande introuvable
vnc2swf: command not found
vnc2swf: käsku ei ole
vnc2swf: không tìm thấy lệnh
vnc2swf: komanda nerasta
vnc2swf: Kommando nicht gefunden.
vnc2swf: kommandot finns inte
vnc2swf: komut yok
vnc2swf: nie znaleziono polecenia
vnc2swf: níor aimsíodh an t-ordú
vnc2swf: no se encontró la orden
vnc2swf: no s'ha trobat l'ordre
vnc2swf: opdracht niet gevonden
vnc2swf: parancs nem található
vnc2swf: perintah tidak ditemukan
vnc2swf: príkaz nenájdený
vnc2swf: příkaz nenalezen
vnc2swf: команда не найдена
vnc2swf: командата не е открита
vnc2swf: 命令找不到
vnc2swf: コマンドが見つかりません