I’ve exported my old WP blog and installed the WP import plugin on my new site. When I use this plugin to import to my new blog then this is what I get (the import XML file is 14.6 mB in size, and it is not empty):
Sorry, there has been an error.
File is empty. Please upload something more substantial. This error could also be caused by uploads being disabled in your php.ini or by post_max_size being defined as smaller than upload_max_filesize in php.ini.
My php.ini file looks like this:
memory_limit = 32M;
upload_max_filesize = 20M;
post_max_size = 100M;