When attempting to upload files via the WordPress admin to your blog you might receive the below error. This error can be caused for a couple different reasons of which the main reason relates to permissions. Resolving the issue is a security risk but depending on how convenient you want it to be to upload files will depend on if you should use the WP admin or if you should just FTP the files to your blog site.
Error: WordPress File Upload Error: The uploaded file could not be moved to /wordpress/root/wp-content/uploads/2009/04
Below I list two different causes and resolutions for each one.