simpbit.dll: 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/lib64/mp/bin/simpbit.dll - from package: mp
/usr/lib/mp/bin/simpbit.dll - from package: mp

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

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