mount.dapfs: 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:

/sbin/mount.dapfs - from package: dnet-progs

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

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