filterBugs: 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/filterBugs - from package: findbugs

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

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