pdfcsplain: 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/pdfcsplain - from package: texlive

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

On Debian possible default full paths are:

/usr/bin/pdfcsplain - from package: texlive-lang-czechslovak

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

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