stag-selectall_html: 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/stag-selectall_html - from package: libdbix-dbstag-perl

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

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