Error “The service worker navigation preload…”

Hi, first of all I would like to thank the operator for creating a nice plugin. It is not a problem when I have the following problems. And I really hope someone can help, After installing the plugin. On the “Console” tab of the developer tools (F12) the following errors are reported:

1. “The service worker navigation preload request was cancelled before ‘preloadResponse’ settled. If you intend to use ‘preloadResponse’, use waitUntil() or respondWith() to wait for the promise to settle.” Note: (Just let the website hang like that every few minutes, this line appears again)
2. I switch to the “network” tab next to “source”. I see my website query one more red line with name is for example: “xyz.com”, status is “canceled”, type “empty”, Initiator “Preload”, time is ” 634ms”. And every time this query line appears, the command number 1 at the console as above appears
3. The above is everything when i test the admin browser (WordPress logged in) and when i try on the browser the site visitor (not wordpress logged in) there is no display like error number 1 and number 2 (I think these 2 are in the same error). But when I click on the viewsource (Ctril + U) on the client browser. Then it shows this message “This website cannot be accessed The website at https://xyz.com/ may be temporarily down or permanently moved to a new web address.”

I tried uninstalling the PWA, but there are still some files left, and my website still queries PWA related errors. I restored the data before I installed the PWA plugin, and it still has an error (I think it has affected something, and now I can’t fix it even if I remove the Plugin or restore the data)
I really hope you can help. Thank you