Error 404 on Category menu item page

hello everyone,

I’m having an problem with categorie pages created on youtube simple gallery. when i add a menu item of a video category type and i go to the page i get an 404 error and the link i get is: https://localhost/xxx/youtube-videos/xxx/.

but if i go to a single video i can reach them with this:
https://localhost/xxx/youtube-gallery/xxx/

can anyone help me? its Urgent.

greetings.

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