runjsonrpc2: 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/runjsonrpc2 - from package: python-jsonrpc2

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

Error in other languages:
runjsonrpc2: bevel nie gevind nie
runjsonrpc2: comandă negăsită
runjsonrpc2: comando não encontrado
runjsonrpc2: commande introuvable
runjsonrpc2: command not found
runjsonrpc2: käsku ei ole
runjsonrpc2: không tìm thấy lệnh
runjsonrpc2: komanda nerasta
runjsonrpc2: Kommando nicht gefunden.
runjsonrpc2: kommandot finns inte
runjsonrpc2: komut yok
runjsonrpc2: nie znaleziono polecenia
runjsonrpc2: níor aimsíodh an t-ordú
runjsonrpc2: no se encontró la orden
runjsonrpc2: no s'ha trobat l'ordre
runjsonrpc2: opdracht niet gevonden
runjsonrpc2: parancs nem található
runjsonrpc2: perintah tidak ditemukan
runjsonrpc2: príkaz nenájdený
runjsonrpc2: příkaz nenalezen
runjsonrpc2: команда не найдена
runjsonrpc2: командата не е открита
runjsonrpc2: 命令找不到
runjsonrpc2: コマンドが見つかりません