Hi folks, 

I try to complete the "Build a Battle Station App" -> Modify the User Experience. Trail to complete. I checked everything and did it 3 times but every time I get the error:

Challenge Not yet complete... here's what's wrong: 
The 'Resources' related list was not found on the Page Layout 
Note: you may run into errors if you've skipped previous steps.

The Resources Column is in the Page Layout and I add the needed objects. 

Anybody an Idea?

I'm getting the same error even though I'm using the code provided by other users here. The new field is also created.
 

trigger AccountAddressTrigger on Account (before insert, before update) {
    for(Account a : Trigger.new){
        If (a.Match_Billing_Address__c == true) {
            a.ShippingPostalCode = a.BillingPostalCode;
        }   
    }
}

Is there anything wrong with it? 

Thanks in advance.