Error with sitemap.xml

Error with sitemap.xml

So I did my wordpress site using the wp seoclerks theme and also added to google webmaster tools and tried adding sitemaps
and all get are errors normally I can do this sort of thing but it is really annoying me now lol.

Does anyone have any tips what I can do to make these sitemaps work or is there a plugin to help with this. I have yoast will have a look on there .
Another thing maybe off the topic but does wordpress auto ping sites. I did use to use ping o matic a lot not sure if they work any good tho pinging.