cmpress: 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/cmpress - from package: infernal

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

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