ldactoasc: 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/ldactoasc - from package: sextractor

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

On Debian possible default full paths are:

/usr/bin/ldactoasc - from package: sextractor

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

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