start_webtool: 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/lib64/erlang/lib/webtool-0.8.9/priv/bin/start_webtool - from package: erlang-webtool

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

On Debian possible default full paths are:

/usr/bin/start_webtool - from package: erlang-webtool
/usr/lib/erlang/lib/webtool-0.8.10/priv/bin/start_webtool - from package: erlang-webtool

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

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