invalid schema feed

When trying to add this feed to the aggregator and running the update this error appears

TITLE OF FEED "seems to be broken, because of error " invalid schema feed".

Here are the feeds that are giving us trouble.

http://mplic.wordpress.com/feed/

http://mplicjob.wordpress.com/feed/

http://memphiscomputers.blogspot.com/feeds/posts/default

The only forum entries here that were relevant had urls that started with feed:// but that is not the case here.

Any ideas, or is there an alternative module or plugin anyone would recommend?

Thanks,