dcmpschk: 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/dcmpschk - from package: dcmtk

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

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