ace_gperf: 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/ace_gperf - from package: ace-gperf

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

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