Link in Slider CK leads to Error Page 404

Hello, 

I am the slider version 2.4.2 PRO.

When I take an article that can be seen in the blog layout everything is fine.
When I change the category of the article to be shown in the slider, the link does not work any longer.

You can see it here: erv-dinslakener-kobras.de

On the top is the slider, none of the linked articles can be loaded.

Any thoughts on this?

THX
Regards,
Klaus
 

Hi
I have checked and I got this link on the 2nd slide for example
erv-dinslakener-kobras.de/index.php/news...lle-der-1-mannschaft
when I click to go to this page, it works, it loads the article

I have also tested the 1st slide successfully

so have you managed to fix the problem ?
CEd