DOC : Section problèmes connus en cours de rédaction

# Problème connus

## Installation

### Composer : Your requirements could not be resolved to an installable set of packages.

Vous êtes sur PHP 7.4, et composer retourne cette erreur : 

```

Loading composer repositories with package information

Installing dependencies (including require-dev) from lock file

Your requirements could not be resolved to an installable set of packages.

Problem 1

- Installation request for mpdf/mpdf v7.1.9 -> satisfiable by mpdf/mpdf[v7.1.9].

- mpdf/mpdf v7.1.9 requires php ^5.6 || ~7.0.0 || ~7.1.0 || ~7.2.0 || ~7.3.0 -> your PHP version (7.4.21) does not satisfy that requirement.

Problem 2

- mpdf/mpdf v7.1.9 requires php ^5.6 || ~7.0.0 || ~7.1.0 || ~7.2.0 || ~7.3.0 -> your PHP version (7.4.21) does not satisfy that requirement.

- unicaen/app 3.1.12 requires mpdf/mpdf ^7.1 -> satisfiable by mpdf/mpdf[v7.1.9].

- Installation request for unicaen/app 3.1.12 -> satisfiable by unicaen/app[3.1.12].

```

Utiliser la commande *composer* suivant pour ignore les problèmes liès à la version de PHP : 

```

composer install --ignore-platform-reqs

```

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