Strange error message - linked lists (again)

Question

I have to keep at this linked list thing if I'm ever going to really understand it!!
I have created a method to create a linked list via user input. I'm receiving only one strange ERROR, which states:
"This method must return a result of of type ListADT.Node."
And I have just started building my class ListADT...
class ListADT{
public Node createList(int aNumber){     // THIS IS WHERE THE ERROR POINTS
      * integer variable aNumber is the length of the list user wishes to create.
     Scanner console = new Scanner(System.in);
     int number;                    // declare variable number as an integer.
     Node newNode = new Node();          // declare and initialize newNode.
     Node first = new Node();          // declare and initialize first.
     Node last = new Node();               // delcare and initizlize last.
     try
          for(int i = 0; i <= aNumber; i++){               // for loop to enter numbers to build list.
          System.out.println("Please enter an integer: ");     // prompt user.
          number = console.nextInt();                    // assign user input to variable number.
          newNode.info = number;          // assign number to newNode;
          if(first == null){               // checks to see if Node first is a null value.
               first = newNode;          // if true, then this node is the first and last node in the list.
               last = newNode;
          else{                              // if first is not null, then newNode is placed at the end of the list.
               last.link = newNode;
               last = newNode;
          return first;
     catch (InputMismatchException imeRef)     //Catches non-integer values
          System.out.println("You entered a non-Integer! " + imeRef.toString());     //Prints error message

Answer 1

Now why can't the error messages help
out a little more? I would have never guessed that
there was a problem with the catch block not
returning anything!!The message was pretty informative -- it told you what was wrong. If the compiler could be so smart as to be able to tell you exactly what to fix, then the compiler would be able to write code all by itself -- and then you'd be out of a job.