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i will need your precious help. I am doing my final report for my school and i am writing in LaTeX. I want to write it in greek and i am using babel package. But when i complile it, display the title above: "Missing number, treated as zero. \ldf@finish\CurrentOption". File English.ldf. What is this and how can i fix it? I am newbie, so try to explain it as simple as u can. Thank you for your time.

This is my code:

\documentclass[11pt]{article}
\usepackage[English, Greek]{babel}
\usepackage[iso-8859-7]{inputenc}

\title{An'aptuxh \latintext site \greektext gia diktuak'h dimiourg'ia \LaTeX\ \latintext Document Classes - Manual}
\author{\latintext Name}
\date{\today}

\begin{document}
    \maketitle

        \section{Poioi e'imaste}
        \section{per'i \LaTeX}{
            \subsection{Poioi to 'idrusan}
            \subsection{Pws prof'eretai}}
        \section{Fti'axe to dik'o sou \LaTeX\ \latintext Document}{
            \subsection{Korm'oc \LaTeX\ \latintext Document Class}
            \subsection{Basik'es Entol'es}
            \subsection{'Orise tic dik'ec sou entol'es }}
        \section{P'wc na fti'axeic to dik'o sou \LaTeX\ \latintext Document Class}{
            \subsection{Poia h diafor'a metx'u }}
        \section{xaxaxscxscs}
\end{document}  
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  • 2
    Welcome to TeX.SX! The options to babel should be lowercase: try \usepackage{english,greek]{babel}
    – egreg
    Aug 20 '15 at 20:44
  • Consider switching to UTF-8 as input encoding, rather than iso-8859-7.
    – egreg
    Aug 20 '15 at 21:24
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On my system I get different errors; the first one is

! Package babel Error: Unknown option `English'. Either you misspelled it
(babel)                or the language definition file English.ldf was not found.

You don't get this probably because you're on Windows, where the file system is case insensitive. If an option, say foo, to babel is not predefined, the package looks for a file foo.ldf in the TeX tree.

In your case, on Windows, english.ldf is found because of case insensitivity. However, you get the error, linked to \CurrentOption,

Missing number, treated as zero.

because TeX is case sensitive and english.ldf expects english as the current option.

Solution

Use the official options:

\usepackage[english,greek]{babel}

All options to babel are lowercase.

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