wvRTF: 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/wvRTF - from package: wv

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

On Debian possible default full paths are:

/usr/bin/wvRTF - from package: wv

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

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