Sorry, I know the “data error” is confusing. What it means is that when Micro.blog was processing an item item in the RSS feed, something went wrong with trying to save that data to Micro.blog’s database. Usually this is some kind of encoding problem or unexpected data in one of the fields.
Another thing I noticed is that one of your post dates is “01 Jan 0001”. This is probably because it’s a standalone page (“About”) and not actually a blog post. If you can exclude this from your RSS feed, that will probably fix it assuming that is the issue.