online-access-registry: 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/mpich/bin/online-access-registry - from package: scorep-mpich
/usr/lib64/openmpi/bin/online-access-registry - from package: scorep-openmpi
/usr/bin/online-access-registry - from package: scorep

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

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