I installed nextcloud version 29.0.0, everything works properly, but the news application does not work properly, I encounter a problem like the picture I gave. I would appreciate if you can help.
Are You at news V24?
Than that is a known behaviour.
Try the V25 beta or read or open an issue here:
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how do I download the beta version
i installed nextcloud on the server i bought from amazon. how do i download it to this server? where do i download it? how do i install it? i would be happy if you help me.
See the note about enabling beta release access in the apps chapter in the Admin Manual: Apps management — Nextcloud latest Administration Manual latest documentation
Just be conscious that it’ll also enable it for other apps so don’t leave enabled and forget. 
As @jtr mentioned, you can install it over the web ui.
Or you dowload it from the link, I provided above
( https://github.com/nextcloud/news/releases/download/25.0.0-alpha5/news.tar.gz ),
remove the folder /var/www/nextcloud/apps/news and unzip the beta archive to /var/www/nextcloud/apps/news
Beware, that your filestructure can be diferent.
See also:
https://docs.nextcloud.com/server/latest/admin_manual/contents.html
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