I am working in https://developer.salesforce.com/trailhead/point_click_business_logic/validation_rules.I have following message in validate rule:"Challenge Not yet complete... here's what's wrong: 
The validation rule failed to enforce the business logic"
My examples:
1.NOT(ISBLANK(AccountId)) && Account.ShippingPostalCode != MailingPostalCode
2.AND( NOT(ISBLANK(AccountId)),
 MailingPostalCode != Account.ShippingPostalCode
 )
3.AND( NOT(ISBLANK(AccountId)),
 MailingPostalCode <> Account.ShippingPostalCode
 )
Help me please solve this problem!

Create an Apex class that returns an array (or list) of strings: 
Create an Apex class that returns an array (or list) of formatted strings ('Test 0', 'Test 1', ...). The length of the array is determined by an integer parameter.The Apex class must be called 'StringArrayTest' and be in the public scope.
The Apex class must have a public static method called 'generateStringArray'.
The 'generateStringArray' method must return an array (or list) of strings. Each string must have a value in the format 'Test n' where n is the index of the current string in the array. The number of returned strings is specified by the integer parameter to the 'generateStringArray' method.

MyApexClass to above Challenge:

public class StringArrayTest {
    
    public static List<string> generateStringArray(Integer n)
    {
        List<String> myArray = new List<String>();
        
        for(Integer i=0;i<n;i++)
        {
            myArray.add('Test'+i);
            System.debug(myArray[i]);
        }
        return myArray;
        
    }

It's compile and execute as per requirement in Developer console. But Traihead showing the below error:

Challenge not yet complete... here's what's wrong: 
Executing the 'generateStringArray' method failed. Either the method does not exist, is not static, or does not return the proper number of strings.

Anyhelp would be greatly appreciated. Thanks.
 

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