Hello i use directadmin and roundcube in version 0.9.0  Composer work, but i get verytime error: Loading composer repositories with package information Installing dependencies Your requirements could not be resolved to an installable set of packages.     Problem 1     - The requested package cor/message_highlight could not be found in any version, there may be a typo in the package name.   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://groups.google.com/d/topic/composer-dev/_g3ASeIFlrc/discussion%3E; for more details.   Read <http://getcomposer.org/doc/articles/troubleshooting.md%3E; for further common problems.     How i can install some plugin? My composer.json:       "require": {       "cor/message_highlight": "2.2"     } }