exciting-spacegroup: 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/exciting-spacegroup - from package: exciting-common

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

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