copy_reads: 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/lib/staden/bin/copy_reads - from package: staden

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

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