During active development session, some non-update configuration that load non-exists service-provider or packages could stop unexpectedly composer update
command when you try to synchronize your local repository.
If this happening while you pull new code from this repo, you could execute :
cd /path/to/meetings
# Delete all previous lock and vendor
rm composer.lock
rm vendor -r
# Install fresh
php composer.phar install
# In unix environment, these additional steps may needed
chmod 777 app/storage/meta -R
sudo service apache2 restart
curl -s http://getcomposer.org/installer | php
php composer.phar install