Not working pagination issue

Hi guys.

I’m now creating a website with wordpress that needs 2 type of POST :
1. Usual wordpress post, and
2. Testimony post (using Easy Post Types, see here)

I have no problem with the wordpress post. But the problem occurs when I tag a testimony post into a blog tag, for example ‘World’. The tag ‘World’ it self contain those 2 type of POST mentioned above. For example, I have 1 testimony post, and 3 blog post, so I have 4 posts.

Then I change the script to adapt this changes, then I use kriesi_pagination(4) (see here.

For example :
– Total data found : 4
– Data to display per page : 1
– Page needed = ceil(Total data found/Data to display per page) = 4

Kresi successfully created 4 hyperlink to each page. Example :
1. http://localhost/tag/data/ –> data is blog tag
2. http://localhost/tag/data/page/2/
3. http://localhost/tag/data/page/3/
4. http://localhost/tag/data/page/4/

If I try 1-3, there are no problem occurs. But when I go to the page 4, what I see is “This is somewhat embarrassing, isn’t it? It seems we can’t find what you’re looking for. Perhaps searching, or one of the links below, can help.” (this text come from 404.php of the theme)

The problem is, why wordpress can’t support page 4 just like what I need, and how to fix this? thanks.