elpa2_print_kernels_openmp: 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/elpa2_print_kernels_openmp - from package: elpa-mpich
/usr/lib/mpich/bin/elpa2_print_kernels_openmp - from package: elpa-mpich

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

Error in other languages:
elpa2_print_kernels_openmp: bevel nie gevind nie
elpa2_print_kernels_openmp: comandă negăsită
elpa2_print_kernels_openmp: comando não encontrado
elpa2_print_kernels_openmp: commande introuvable
elpa2_print_kernels_openmp: command not found
elpa2_print_kernels_openmp: käsku ei ole
elpa2_print_kernels_openmp: không tìm thấy lệnh
elpa2_print_kernels_openmp: komanda nerasta
elpa2_print_kernels_openmp: Kommando nicht gefunden.
elpa2_print_kernels_openmp: kommandot finns inte
elpa2_print_kernels_openmp: komut yok
elpa2_print_kernels_openmp: nie znaleziono polecenia
elpa2_print_kernels_openmp: níor aimsíodh an t-ordú
elpa2_print_kernels_openmp: no se encontró la orden
elpa2_print_kernels_openmp: no s'ha trobat l'ordre
elpa2_print_kernels_openmp: opdracht niet gevonden
elpa2_print_kernels_openmp: parancs nem található
elpa2_print_kernels_openmp: perintah tidak ditemukan
elpa2_print_kernels_openmp: príkaz nenájdený
elpa2_print_kernels_openmp: příkaz nenalezen
elpa2_print_kernels_openmp: команда не найдена
elpa2_print_kernels_openmp: командата не е открита
elpa2_print_kernels_openmp: 命令找不到
elpa2_print_kernels_openmp: コマンドが見つかりません