aewm++_fspanel: 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/aewm++_fspanel - from package: aewm++-goodies

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

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