cannaserver: 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/sbin/cannaserver - from package: Canna

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

On Debian possible default full paths are:

/usr/sbin/cannaserver - from package: Canna

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

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