PrecursorIonSelector: 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/PrecursorIonSelector - from package: topp

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

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