flashbench-erase: 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/flashbench-erase - from package: flashbench

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

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