Problem after creating the category menu items

Hi

I have created category menu items for each of my categories when you get taken to the category page the first 3 posts are shown with an older posts button at the bottom.
When you click on the older posts button you dont get any more posts from the category you get this message
"It seems we can’t find what you’re looking for. Perhaps searching, or one of the links below, can help."
This happens on all 9 categories
How do I solve this?

Thanks

sorry just realised this should be in the news 2 thread
Also now im getting a fatal error message when using the news2 template
I have tried the site with your shop and buy theme and the wordpress twenty fifteen theme and it works fine.
I also tried deleting the News2 theme and re uploading it and I still get the fatal error message.

Hi,
Could you please provide me with a URL to your website and back-end access via PM (click the “Private Message” text underneath my avatar) so that I may analyze it?

I have used another Gavick template for the site in question and everythings working fine now so no need to worry.
Thanks