qml1plugindump: 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/bin/qml1plugindump - from package: qt5-qtquick1-devel
/usr/lib64/qt5/bin/qml1plugindump - from package: qt5-qtquick1-devel
/usr/lib/qt5/bin/qml1plugindump - from package: qt5-qtquick1-devel

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

On Debian possible default full paths are:

/usr/bin/qml1plugindump - from package: qtchooser
/usr/lib/x86_64-linux-gnu/qt5/bin/qml1plugindump - from package: qtquick1-5-dev-tools

You may install the required package with command apt-get install {package}

Error in other languages:
qml1plugindump: bevel nie gevind nie
qml1plugindump: comandă negăsită
qml1plugindump: comando não encontrado
qml1plugindump: commande introuvable
qml1plugindump: command not found
qml1plugindump: käsku ei ole
qml1plugindump: không tìm thấy lệnh
qml1plugindump: komanda nerasta
qml1plugindump: Kommando nicht gefunden.
qml1plugindump: kommandot finns inte
qml1plugindump: komut yok
qml1plugindump: nie znaleziono polecenia
qml1plugindump: níor aimsíodh an t-ordú
qml1plugindump: no se encontró la orden
qml1plugindump: no s'ha trobat l'ordre
qml1plugindump: opdracht niet gevonden
qml1plugindump: parancs nem található
qml1plugindump: perintah tidak ditemukan
qml1plugindump: príkaz nenájdený
qml1plugindump: příkaz nenalezen
qml1plugindump: команда не найдена
qml1plugindump: командата не е открита
qml1plugindump: 命令找不到
qml1plugindump: コマンドが見つかりません