cacaserver: 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/cacaserver - from package: caca-utils

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

On Debian possible default full paths are:

/usr/bin/cacaserver - from package: caca-utils

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

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