bp_tree2pag: 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/bp_tree2pag - from package: bioperl

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

Error in other languages:
bp_tree2pag: bevel nie gevind nie
bp_tree2pag: comandă negăsită
bp_tree2pag: comando não encontrado
bp_tree2pag: commande introuvable
bp_tree2pag: command not found
bp_tree2pag: käsku ei ole
bp_tree2pag: không tìm thấy lệnh
bp_tree2pag: komanda nerasta
bp_tree2pag: Kommando nicht gefunden.
bp_tree2pag: kommandot finns inte
bp_tree2pag: komut yok
bp_tree2pag: nie znaleziono polecenia
bp_tree2pag: níor aimsíodh an t-ordú
bp_tree2pag: no se encontró la orden
bp_tree2pag: no s'ha trobat l'ordre
bp_tree2pag: opdracht niet gevonden
bp_tree2pag: parancs nem található
bp_tree2pag: perintah tidak ditemukan
bp_tree2pag: príkaz nenájdený
bp_tree2pag: příkaz nenalezen
bp_tree2pag: команда не найдена
bp_tree2pag: командата не е открита
bp_tree2pag: 命令找不到
bp_tree2pag: コマンドが見つかりません