WordPress category error

can any one help me with this.?
i m struggling with this since 2-3 days !
http://techhack[dot]tk
this is my blog, now, the blog looks perfect. But when i click on category it shows error.
can any one tell me why is this .?
for category links go to the below of the page and click on any category …
or
goto
http://techhack[dot]tk/category/fun/
or
http://techhack[dot]tk/category/application/

Answer #1
I had same problem in my wp blog. Do u run it in a free webhosting? Cos they are not reliable and database are not stable. NOTHING can be done unless u edit all posts and add category and tags.