djvm: 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 CentOS possible default full paths are:

/usr/bin/djvm - from package: djvulibre

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/djvm - from package: djvulibre-bin

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

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