onto2vocabularyclass: 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/onto2vocabularyclass - from package: soprano

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

On Debian possible default full paths are:

/usr/bin/onto2vocabularyclass - from package: soprano-daemon

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

Error in other languages:
onto2vocabularyclass: bevel nie gevind nie
onto2vocabularyclass: comandă negăsită
onto2vocabularyclass: comando não encontrado
onto2vocabularyclass: commande introuvable
onto2vocabularyclass: command not found
onto2vocabularyclass: käsku ei ole
onto2vocabularyclass: không tìm thấy lệnh
onto2vocabularyclass: komanda nerasta
onto2vocabularyclass: Kommando nicht gefunden.
onto2vocabularyclass: kommandot finns inte
onto2vocabularyclass: komut yok
onto2vocabularyclass: nie znaleziono polecenia
onto2vocabularyclass: níor aimsíodh an t-ordú
onto2vocabularyclass: no se encontró la orden
onto2vocabularyclass: no s'ha trobat l'ordre
onto2vocabularyclass: opdracht niet gevonden
onto2vocabularyclass: parancs nem található
onto2vocabularyclass: perintah tidak ditemukan
onto2vocabularyclass: príkaz nenájdený
onto2vocabularyclass: příkaz nenalezen
onto2vocabularyclass: команда не найдена
onto2vocabularyclass: командата не е открита
onto2vocabularyclass: 命令找不到
onto2vocabularyclass: コマンドが見つかりません