RSS ERROR – No RSS items found with URL

I’m getting “RSS ERROR – No RSS items found with URL” although it was working until yesterday.

WordPress version: 5.9.3
Plugin version: 1.6.5

Shortcodes tested:

[wp_rss_retriever url=”https://alliance-wrestling.com/feed/” items=”10″ excerpt=”50″ read_more=”true” credits=”true” new_window=”true” thumbnail=”200″ cache=”2 hours”]

[wp_rss_retriever url=”https://alliance-wrestling.com/category/national-wrestling-alliance/feed/” items=”10″ excerpt=”50″ read_more=”true” credits=”true” new_window=”true” thumbnail=”200″ cache=”2 seconds”]

[wp_rss_retriever url=”https://alliance-wrestling.com/category/national-wrestling-alliance/feed/?format=xml” items=”10″ excerpt=”50″ read_more=”true” credits=”true” new_window=”true” thumbnail=”200″ cache=”2 seconds”]

First two codes were working yesterday. I tried with “?format-xml” (as in the third shortcode) but no luck. These feeds work fine with a script that I use in a non-WordPress website. I tried using the same script in “Custom HTML” and it worked fine, but I’d rather use your plugin.

The page I need help with: [log in to see the link]