AirInvServer: 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/AirInvServer - from package: airinv

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

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