wotsap: 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 Debian possible default full paths are:

/usr/bin/wotsap - from package: wotsap

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

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