To solve the error in Opera, you can refer to the following ways:
Make sure your network is working, and strong enough.
Disable hardware acceleration. Click on the Opera logo and select Settings.
Disable the extensions and Opera's built-in VPN.
Delete cache and cookies.
Reset browser settings or reinstall Opera.

Opera also lets you see which trackers it's blocking: When you're on a site, the blue shield icon in the address bar will show a checkmark if it's active. Click “List of blocked trackers” to see which trackers Opera is currently blocking

Under "Account settings," click Notifications. Under "Channel subscriptions," check the box next to "Occasionally Notify me of new videos and activity from my subscriptions." Select whether you would like the notifications to come in as "Push," "Email," or both. Push notifications show on your mobile screen.

Every android app will have list of URLs that it can open. So you have to go to that app settings and tell that it should open in browser for the URLs and not in the app.

To do that go to Settings -> Apps -> scroll down to the app that you don't want URLs to open in -> Tap on 'Open by Default' and select always Ask. So next time you click on a url it won't open in any app directly it will ask you and you choose it to open in Opera.

You can revert back to the new Speed Dial page at any time by either clicking on “Go back to the old start page” link at the bottom-right corner of the Speed Dial page or by changing value of “Experimental start page” option in opera://flags page to Default (disabled) again.

To solve the error in Opera, you can refer to the following ways:
Make sure your network is working, and strong enough.
Disable hardware acceleration. Click on the Opera logo and select Settings.
Disable the extensions and Opera's built-in VPN.
Delete cache and cookies.
Reset browser settings or reinstall Opera.

Opera also lets you see which trackers it's blocking: When you're on a site, the blue shield icon in the address bar will show a checkmark if it's active. Click “List of blocked trackers” to see which trackers Opera is currently blocking