lpsparelm: 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/lpsparelm - from package: mcrl2

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

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