There was an error uploading this file to the server.
The most common reason for this problem is that the File you have uploaded is too big. The File Size Upload Limit on your Server is set too low to allow larger files to be uploaded. By default PHP allows files up to 2 MB, but you can set to 8 MB to get rid of this error.
If you have access to the php.ini, then change the directive upload_max_filesize to “8M” and reload the server configuration.
If you are running PHP in CGI mode on Apache, you can place an .htaccess file in your Joomla! root directory and place the following code inside:
php_value upload_max_filesize 8M