gss_destroy_creds: 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/sbin/gss_destroy_creds - from package: nfs-common

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

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