Getting unknown urls in Crawling errors?

[Anjana]

When ever i am checking crawling errors on google webmaster tools, it shows some unknown urls which are not in my website.
example links:
<!-- m --><a class="postlink" href="http://www.example.com/shopbrand/004/002/X">http://www.example.com/shopbrand/004/002/X</a><!-- m -->
<!-- m --><a class="postlink" href="http://www.example.com/shopdetail/003003000022">http://www.example.com/shopdetail/003003000022</a><!-- m -->
<!-- m --><a class="postlink" href="http://www.example.com/shop/shopbrand.html?search=&prize1=%83T%83%93%83z%83%8F%83C%83g">http://www.example.com/shop/shopbrand.h ... 8F%83C%83g</a><!-- m -->
<!-- m --><a class="postlink" href="http://www.example.com/shop/basket.html">http://www.example.com/shop/basket.html</a><!-- m -->
<!-- m --><a class="postlink" href="http://www.example.com/shopbrand/ct608">http://www.example.com/shopbrand/ct608</a><!-- m -->

Here /shopbrand, /shopdetail, /shop , /shop/basket urls are not in my website. why iam getting these urls in crawling errors?