bls: 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/sbin/bls - from package: bacula-storage-common

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

On Debian possible default full paths are:

/usr/sbin/bls - from package: bacula-sd
/usr/sbin/bls - from package: bareos-tools
/usr/lib/debug/usr/sbin/bls - from package: bacula-sd-dbg
/usr/lib/debug/usr/sbin/bls - from package: bareos-dbg

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

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