wsdl2: 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/wsdl2 - from package: mono-web

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

On Debian possible default full paths are:

/usr/bin/wsdl2 - from package: mono-devel

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

Error in other languages:
wsdl2: bevel nie gevind nie
wsdl2: comandă negăsită
wsdl2: comando não encontrado
wsdl2: commande introuvable
wsdl2: command not found
wsdl2: käsku ei ole
wsdl2: không tìm thấy lệnh
wsdl2: komanda nerasta
wsdl2: Kommando nicht gefunden.
wsdl2: kommandot finns inte
wsdl2: komut yok
wsdl2: nie znaleziono polecenia
wsdl2: níor aimsíodh an t-ordú
wsdl2: no se encontró la orden
wsdl2: no s'ha trobat l'ordre
wsdl2: opdracht niet gevonden
wsdl2: parancs nem található
wsdl2: perintah tidak ditemukan
wsdl2: príkaz nenájdený
wsdl2: příkaz nenalezen
wsdl2: команда не найдена
wsdl2: командата не е открита
wsdl2: 命令找不到
wsdl2: コマンドが見つかりません