We have created an extension that works if we install it manually, i.e. tar xvfz [filename] into the Magento directory.
However we would like to package and install it through Magento Connect, but run into the following error during Install (after creating the package according to the guide)
CONNECT ERROR: Package 'Melissa_Plugin' is invalid'.' already exists
So I took a look inside the package (after getting the extension key) using the downloader at http://freegento.com/ddl-magento-extension.php and there are no files which conflict with existing files in Magento.
Why does it complain about '.' ?