libplayer-test: 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/libplayer-test - from package: libplayer-bin

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

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