bp_seqfeature_gff3: 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_seqfeature_gff3 - from package: bioperl

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

Error in other languages:
bp_seqfeature_gff3: bevel nie gevind nie
bp_seqfeature_gff3: comandă negăsită
bp_seqfeature_gff3: comando não encontrado
bp_seqfeature_gff3: commande introuvable
bp_seqfeature_gff3: command not found
bp_seqfeature_gff3: käsku ei ole
bp_seqfeature_gff3: không tìm thấy lệnh
bp_seqfeature_gff3: komanda nerasta
bp_seqfeature_gff3: Kommando nicht gefunden.
bp_seqfeature_gff3: kommandot finns inte
bp_seqfeature_gff3: komut yok
bp_seqfeature_gff3: nie znaleziono polecenia
bp_seqfeature_gff3: níor aimsíodh an t-ordú
bp_seqfeature_gff3: no se encontró la orden
bp_seqfeature_gff3: no s'ha trobat l'ordre
bp_seqfeature_gff3: opdracht niet gevonden
bp_seqfeature_gff3: parancs nem található
bp_seqfeature_gff3: perintah tidak ditemukan
bp_seqfeature_gff3: príkaz nenájdený
bp_seqfeature_gff3: příkaz nenalezen
bp_seqfeature_gff3: команда не найдена
bp_seqfeature_gff3: командата не е открита
bp_seqfeature_gff3: 命令找不到
bp_seqfeature_gff3: コマンドが見つかりません