wftopfa: command not found

Have You tried accessing the binary with the full path?

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/wftopfa - from package: ghostscript

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

On Debian possible default full paths are:

/usr/bin/wftopfa - from package: ghostscript

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