kwalletaskpass: 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/kwalletaskpass - from package: kwalletcli

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

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