SemanticValidator: 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/SemanticValidator - from package: topp

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

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