Search in news extension shows 404-page

TYPO3 Questions Extensions
1

Hi,
I added a search page for my news.
I use the plugin newssearchform with page-ID for List view or without (to show on the same page).
I add the plugin for the search results.
The page shows up, but if I enter a searchtext and submit a 404-page ist shown.
I used the search before, but I don’t understand why it is not working now.
Kind regards
Bernd

Typo3 13.4.8 latest news extension

2

404 indicates a urls is not correct - so that will be the first thing to check: Does the pid point to a available, not-hidden-or-deleted page?