[Tex/LaTex] Underfull hbox(10000) at \begin{document}

warnings

I am new to Latex and I have these strange warnings which say :

/File.tex:79:Underfull \hbox (badness 10000) in paragraph
/File.tex:79:Underfull \hbox (badness 1337) in paragraph
/File.tex:79:Underfull \hbox (badness 1881) in paragraph
/File.tex:79:Underfull \hbox (badness 1803) in paragraph

The strange thing is that the line referred to 79 is the begin{document} line.

It also does it for other lines which happen to be the begginings of new paragraphs.

What did I do wrong and how can I fix it?

Thanks!

This is the tex code up to the begin{document} line :

%% -*- TeX -*- -*- FR -*-

%Avant propos : ces exemples de fichiers ont été mis à jour grâce à
%l'aide précieuse de Gilbert Ritschard. Pour toute question ou
%remarque n'hésitez pas à nous contacter : venturin@univ-tours.fr ou
%gilbert.ritschard@themes.unige.ch
%Version 3 2008-05-21
%Version 3.1 2012-11-26 Bruno Pinaud <bruno.pinaud@labri.fr>

\documentclass[a4paper,french]{rnti}
%\documentclass[a4paper,french,submission]{rnti}  %% pour soumission à EGC

%\documentclass[a4paper,french,noresume]{rnti} %% Pour papier de 2 pages

%%% Avec l'option "showlayout" vous obtenez les deux pages
%%% de contrôle des paramètres de mise en page.

%\documentclass[a4paper,footer,french,showlayout]{rnti}

%packages nécessaires pour écrire des articles en français en utilisant les accents non latex.
\usepackage[T1]{fontenc}
\usepackage[latin1]{inputenc}

%pour bien présenter les URL et autres adresses emails
\usepackage{url}

\usepackage{graphicx}

\usepackage{float}

\pretolerance=10000

% Titre court pour entête
\titrecourt{XEWGraph : Visualisation et Analyse des Hypergraphes}

% Noms auteurs pour entête :
%    Si un seul auteur, mettre : Initiale. NomPremierAuteur
%    Si deux auteurs, mettre : Initiale1. NomPremierAuteur et Initiale1. NomDeuxiemeAuteur
%    Si plus de deux auteurs, mettre comme ci-dessous
%
\nomcourt{Z. BOULOUARD, A. EL HADDADI et L. KOUTTI}

\titre{XEWGraph : Outil de Visualisation et Analyse des Hypergraphes pour un Système d'Intelligence Economique }

\auteur{Zakaria BOULOUARD\affil{1},
        Anass EL HADDADI\affil{2}\\
         Lahcen KOUTTI\affil{3}}

\affiliation{
    \affil{1}Faculté des Sciences Agadir\\
          zboulouard@gmail.com\\
    %
    \affil{2}ENSA Al Hoceima\\
          anass.elhaddadi@gmail.com\\
    %
    \affil{3}Faculté des Sciences Agadir\\
          lkoutti@yahoo.fr
 }

\resume{%
L'Intelligence Economique (Competitive Intelligence en anglais) est un ensemble coordonné de recherches, d'extractions et de traitements 
d'informations utiles pour les décideurs afin de leur faciliter le processus de prise de décision. Le Système d'Intelligence Economique 
Xplor EveryWhere (XEW) permet à ses utilisateurs de rechercher, afficher, valider et rediffuser l'information utile. Sur ce papier, nous 
allons présenter l'outil Xplor EveryWhere puis nous allons nous concentrer sur son nouveau module XEWGraph dédié à l'analyse des données 
massives et la visualisation des hypergraphes.
%
}

\summary{%
Competitive Intelligence est a set of coordinated researches, extractions and treatments of information that stakeholders find useful for
them in order to ease the process of decision making. The Competitive Intelligence System Xplor EveryWhere (XEW) helps its users search,
visualize, validate and share useful data. In this paper, we will intorduce Xplor EveryWhere and we will spot the light on its newest 
feature called XEWGraph, which is dedicated to the analysis of massive data and visualization of hypergraphs.
%
} 


\begin{document}

Best Answer

You can get a bit more information about the boxes by adding 

\showboxdepth100
\showboxbreadth100

to the top of the file, then look in the log.

Note the lines are all reported at \begin{document} as this class incorporates the command usually known as \maketitle into the \begin{document} setup. The commands for author, address etc do not typeset anything they just save the data, so the warnings are reported when the text is set.

Underfull \hbox (badness 10000) in paragraph at lines 81--81

\hbox(0.0+0.0)x375.57628
.\glue(\rightskip) 0.0

That was is an infinitely bad box with a blank line that has no text or stretchy glue, that is trying to be full width. (as stray \\ is common cause of this)

Underfull \hbox (badness 1275) in paragraph at lines 81--81
\T1/ptm/m/n/10 un ensemble coordonnÃ[] de recherches, d'extractions et de trait
ements

That's not so bad, tex just had to stretch the white space a bit more than it would like to set that paragraph

Underfull \hbox (badness 1852) in paragraph at lines 81--81
\T1/ptm/m/n/10 de prise de dÃ[]cision. Le SystÃ^^Dme d'Intelligence Economique 
Xplor

same

Underfull \hbox (badness 10000) in paragraph at lines 81--81
\hbox(0.0+0.0)x375.57628
.\glue(\rightskip) 0.0

another infinitely bad line that looks like white space

Underfull \hbox (badness 1275) in paragraph at lines 81--81
\T1/ptm/m/n/10 un ensemble coordonnÃ[] de recherches, d'extractions et de trait
ements

again tex had to stretch white space to fit this line

Underfull \hbox (badness 1852) in paragraph at lines 81--81
\T1/ptm/m/n/10 de prise de dÃ[]cision. Le SystÃ^^Dme d'Intelligence Economique 
Xplor

The main reason that TeX is having problems setting this text is

\pretolerance=10000

which really has no good effects, deleting that line makes them go (apart from one 10000, which is probably a spurious \\) I should note I had problems saving the posted text in utf8 for some reason.

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