I am trying to insert contact related to an account but not saving,here is the apex code

public class AccountHandller {     @AuraEnabled     public static Account createAccount(String accountName)     {          try {              Account acct = new Account(Name='accountName');                               // Insert the account                          insert acct;                    return acct;                             // Get this ID.           // Add a contact to this account.     Contact con = new Contact(         FirstName='Joe',         LastName='Smith',         Phone='415.555.1212',         AccountId=acct.Id);     insert con;                                                        } catch (DmlException e) {     System.debug('A DML exception has occurred: ' +                 e.getMessage());      return null;   //catch the failed DML and then return null }     }                                           }