gwenview_importer: 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 Debian possible default full paths are:

/usr/bin/gwenview_importer - from package: gwenview

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

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