Problems with "helloworld" and "catgifs" in WSL

I have installed version 29 of Nextcloud on WSL. The path to my apps is \wsl.localhost\Ubuntu\var\www\nextcloud\apps. I am creating ‘Helloworld’ and ‘Catgifs’ and adding them there. They appear, I activate them, but they don’t run for me. For example, in ‘Catgifs’ I put a console.log in mainScript.js but it doesn’t show up. I’m not sure if it’s due to a path problem. Thank you and I await your response

So the normal Nextcloud is working for you, and you want to develop your own app?

Logfiles can be really helpful for this. Is this still some example code, or do you have it in a repo or something so people can take a look?