l'have this error :
$ php composer.phar require sabre/vobject "^4.0"
./composer.json has been updated
Loading composer repositories with package information
Updating dependencies (including require-dev)
Your requirements could not be resolved to an installable set of packages.
Problem 1
- The requested package sabre\vobject could not be found, it looks like
its name is invalid, "\" is not allowed in package names.
Potential causes:
- A typo in the package name
- The package is not available in a stable-enough version according to
your minimum-stability setting
see <https://getcomposer.org/doc/04-schema.md#minimum-stability> for
more details.
Read <https://getcomposer.org/doc/articles/troubleshooting.md> for further
common problems.
Installation failed, reverting ./composer.json to its original content.
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