vanessa_logger_sample: 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/vanessa_logger_sample - from package: vanessa_logger-sample

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

On Debian possible default full paths are:

/usr/bin/vanessa_logger_sample - from package: libvanessa-logger-sample

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

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