qtplugininfo: 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/qt5/bin/qtplugininfo - from package: qt5-qttools-devel
/usr/lib/qt5/bin/qtplugininfo - from package: qt5-qttools-devel

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

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