cmpfillin64: command not found

Have You tried accessing the binary with the full path?

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/cmpfillin64 - from package: metis64

You may install the required package with command yum install {package}
Error in other languages:
cmpfillin64: bevel nie gevind nie
cmpfillin64: comandă negăsită
cmpfillin64: comando não encontrado
cmpfillin64: commande introuvable
cmpfillin64: command not found
cmpfillin64: käsku ei ole
cmpfillin64: không tìm thấy lệnh
cmpfillin64: komanda nerasta
cmpfillin64: Kommando nicht gefunden.
cmpfillin64: kommandot finns inte
cmpfillin64: komut yok
cmpfillin64: nie znaleziono polecenia
cmpfillin64: níor aimsíodh an t-ordú
cmpfillin64: no se encontró la orden
cmpfillin64: no s'ha trobat l'ordre
cmpfillin64: opdracht niet gevonden
cmpfillin64: parancs nem található
cmpfillin64: perintah tidak ditemukan
cmpfillin64: príkaz nenájdený
cmpfillin64: příkaz nenalezen
cmpfillin64: команда не найдена
cmpfillin64: командата не е открита
cmpfillin64: 命令找不到
cmpfillin64: コマンドが見つかりません