hmm-assembler.pl: 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/hmm-assembler.pl - from package: snap

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

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