¿What's the error with my java code?

1. So I don't know but I think there's a mistake in the last part...the problem is that I don't know exactly what's wrong or how to fix it. 2.The last part in the while seems to be the problem, but I need a more concrete explanation and how to solve this.

    import java.util.Scanner;
   public class Users{
       public static void main (String [] args){
   
       Scanner in = new Scanner(System.in);
   
       do 
       {
   
       System.out.println("Hello, please write your username: ");
       username = in.nextLine();
   
       System.out.println("Hello, please write your password: ");
       password = in.nextLine();
   
       if (!username.equals(Homie) && !password.equals(hello)){
   
       System.out.println("Sorry but username or password are not valid, ¿Do you want to create a new one yes/no (password al teast 8 digits): ");
       answer = in.nextLine();
   
   
       } else if (answer.equals(yes)){
   
       System.out.println("Select a new username: ");
       otherusername = in.nextLine();
   
       System.out.println("Select a new password: ");
       otherpassword = in.nextLine();
   
       System.out.println("Welcome:" + otherusername);
       }
   
   
       } while (username.equals(Homie) && password.equals(hello)){
   
       System.out.println("Welcome: " + username);
       }
   
       }
   }