pbmtolj: 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/pbmtolj - from package: netpbm-progs

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

On Debian possible default full paths are:

/usr/bin/pbmtolj - from package: netpbm

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

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