vsd2xhtml: 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/vsd2xhtml - from package: libvisio-tools

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

Error in other languages:
vsd2xhtml: bevel nie gevind nie
vsd2xhtml: comandă negăsită
vsd2xhtml: comando não encontrado
vsd2xhtml: commande introuvable
vsd2xhtml: command not found
vsd2xhtml: käsku ei ole
vsd2xhtml: không tìm thấy lệnh
vsd2xhtml: komanda nerasta
vsd2xhtml: Kommando nicht gefunden.
vsd2xhtml: kommandot finns inte
vsd2xhtml: komut yok
vsd2xhtml: nie znaleziono polecenia
vsd2xhtml: níor aimsíodh an t-ordú
vsd2xhtml: no se encontró la orden
vsd2xhtml: no s'ha trobat l'ordre
vsd2xhtml: opdracht niet gevonden
vsd2xhtml: parancs nem található
vsd2xhtml: perintah tidak ditemukan
vsd2xhtml: príkaz nenájdený
vsd2xhtml: příkaz nenalezen
vsd2xhtml: команда не найдена
vsd2xhtml: командата не е открита
vsd2xhtml: 命令找不到
vsd2xhtml: コマンドが見つかりません