aevol_misc_compute_pop_stats: 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/aevol_misc_compute_pop_stats - from package: aevol

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

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