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Thank you so much, I actually fixed the constructor after posting all that code and have it set to what it is supposed to be. Thank you for alllllll the help! It works now!

Yeah, its says to create a null constructor which im still lost at how to do, This is the books requirements:

2. Create a class named NoSuchCustomerException.java. Without this already in...

EDIT:::

Thank you for your help! I believe I've got, it has compiled with no errors this is what I did:

public class NoSuchCustomerException extends Exception {

private String...

I'm still a bit confused on it, how would I fix this then?
public class NoSuchCustomerException extends Exception {
private String customerNumber;

public void Constructor(){
}

public String...

public String notFound(String customerNumber){
super(" The customer number " + customerNumber.toUpperCase() + " does not exist");
}

I tried to use the super() and it keeps saying this:
...

So when it says to pass the string to the parent class, just put the message inside super(...) ? My second question was about:
2.) Assign the customerNumber value received and initialize the...

Ok so this is the stuff I am working on right now:
2. Create a class named NoSuchCustomerException.java. Without this already in place, you will not be able to compile your CustomerIO class....