Errors on main class an missing packages

[RobertFloor]

My java file used to be fine, but suddenly when I open it again I got the following errors.

• The declared package "" does not match the expected package "src"
• Error Java Implicit super constructor Object() is undefined for default constructor. Must define an explicit constructor

However this should not be necessary with this simple code

Example code

class Card {
    int value;
    String suit;
    String name;

    public String toString() {
        return name + " of " + suit;
    }
}

public class PickACard {
    public static void main(String[] args) {
        System.out.println("test");
    }
}

Additional info :
javac -version
javac 14.0.1
These errors go away if I move the files to a new directory