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What should I do if I got a message from google search work, and this is the message I get from google from Webmaster Tools

Quote:Dear owner or webmaster of http://www.kampoeng.us/

While crawling your site, we have noticed an increase in the number of transient soft 404 errors around 2013-04-22 21:00 UTC (London, Dublin, Edinburgh). Your site may have experienced outages. These issues may have been resolved. Here are some sample pages that resulted in soft 404 errors:

http://www.kampoeng.us/calendar-1-week-233712000.html
http://www.kampoeng.us/calendar-1-week-681264000.html
http://www.kampoeng.us/calendar-1-week-669168000.html

For more information, see our Help Center:

Soft 404 errors

what should I do, or else there are no effects
thanks in advance

as they are not helpful links, disallow such links through robots.txt file
Google SEO plugin consists of a well written robots.txt file. you can use that.

oh
yes I've put a robots.txt file in the main directory of my site, I forgot that I wrote to prohibit view the calendar
maybe this is just the usual message of "tools webmaster"