scheme48: 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/scheme48 - from package: scheme48

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

Error in other languages:
scheme48: bevel nie gevind nie
scheme48: comandă negăsită
scheme48: comando não encontrado
scheme48: commande introuvable
scheme48: command not found
scheme48: käsku ei ole
scheme48: không tìm thấy lệnh
scheme48: komanda nerasta
scheme48: Kommando nicht gefunden.
scheme48: kommandot finns inte
scheme48: komut yok
scheme48: nie znaleziono polecenia
scheme48: níor aimsíodh an t-ordú
scheme48: no se encontró la orden
scheme48: no s'ha trobat l'ordre
scheme48: opdracht niet gevonden
scheme48: parancs nem található
scheme48: perintah tidak ditemukan
scheme48: príkaz nenájdený
scheme48: příkaz nenalezen
scheme48: команда не найдена
scheme48: командата не е открита
scheme48: 命令找不到
scheme48: コマンドが見つかりません