fts_db_cleaner: command not found

Have You tried accessing the binary with the full path?

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/sbin/fts_db_cleaner - from package: fts-server

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