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1. You're using XAMPP on Linux? 😆 Just install Apache, PHP, and whatever else you need through your package manager. Normally. 2. It's code. Singular. "Codes" are things you enter into videogames. 3. Don't reference w3schools. Sometimes they tell you the right thing to do, sometimes they tell you the wrong thing to do, and if you're learning then you won't be able to tell the difference between them. Where did you put main.js? /opt/lampp/htdocs/js/main.js? Then the first form you had is correct. If not then (a) why not? and (b) the second form was correct (except "js/main.js" - no ./ - is cleaner and means the same thing), however you might discover problems with this approach... And changing that won't affect any of your PHP code. The thing with file_put_contents is a completely separate issue. That error is telling you that /opt/lampp/htdocs/pages does not exist. It's also a red flag that you're using code to create this filesList.txt file, but I'm going to ignore it. Also, please tell me you're not running this as root. Use your user account - give it ownership of /opt/lampp/htdocs and everything inside it.