MRMPairFinder: 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/MRMPairFinder - from package: topp

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

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