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I changed the text color of the "while" section

do {
System.out.print("What will be the product ID: ");

while (!scanner.hasNextInt()) {
...

when I run the code this is the error I am getting
run:

Welcome to the Web Host Ordering System

Exception in thread "main" java.lang.RuntimeException: Uncompilable source code - missing return...

Like I said I am new at this and I found the do{....}while{.....scanner.next();} online for validation
The error I am getting says "while expected" when I try to close the do statement

I am trying to validate that a user input valid information at the prompt but I keep getting errors please help!
Here is my code:

private double computeAverageSales() {
WebHost...