PrecursorMassCorrector: 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/PrecursorMassCorrector - from package: topp

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

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