are u using pages router?

oops

But what if I set it to No when creating the project?

or how to configure this for App routing

I see you are using "use client" which means you wanted app router

but your second screenshot tells me that you completely messed up your folder structure

rename your file to not-found.js and place it under src/app/not-found.js

basically where your root layout.tsx

shouldn't the file end with .jsx ?

no .js is correct

.js, .jsx, .tsx all work. .ts won't work.

I found a solution to the problem: for error 404 you can create a not-found.js file in /app and to handle any others use React.FC<ErrorPageProps>

i told u above :)

u can mark my message as solution

Yes, but I googled this yesterday before your answer. Thanks anyway

I just can't mark your answer as correct.

although this may be due to the blocking of discord in Russia...

ok I'll try from my phone

oh wow

this is weird

russia blocking stuff really?

Yes. We have a very strange and stupid thing like Roskomnadzor, from the moment you know what began, they began to block all non-Russian social networks and services for the most stupid reasons. Now in Russia, only Reddit and Twitch are accessible without a VPN (and even Twitch is under threat of blocking)

Therefore, just to write here, I need to turn on VPN :p

I'm afraid that everything will come to the point that the NPM servers will be blocked and we won't even be able to register npm install XD

lmao