wvConvert: 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/wvConvert - from package: wv

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

On Debian possible default full paths are:

/usr/bin/wvConvert - from package: wv

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

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