aida2root: 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/aida2root - from package: rivet-root-converter

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

Error in other languages:
aida2root: bevel nie gevind nie
aida2root: comandă negăsită
aida2root: comando não encontrado
aida2root: commande introuvable
aida2root: command not found
aida2root: käsku ei ole
aida2root: không tìm thấy lệnh
aida2root: komanda nerasta
aida2root: Kommando nicht gefunden.
aida2root: kommandot finns inte
aida2root: komut yok
aida2root: nie znaleziono polecenia
aida2root: níor aimsíodh an t-ordú
aida2root: no se encontró la orden
aida2root: no s'ha trobat l'ordre
aida2root: opdracht niet gevonden
aida2root: parancs nem található
aida2root: perintah tidak ditemukan
aida2root: príkaz nenájdený
aida2root: příkaz nenalezen
aida2root: команда не найдена
aida2root: командата не е открита
aida2root: 命令找不到
aida2root: コマンドが見つかりません