gpasm: 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 CentOS possible default full paths are:

/usr/bin/gpasm - from package: gputils

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/gpasm - from package: gputils

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

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