Hi Experts,
  Pls help me to solve the below issue.I am trying to take a trailhead challenge and i have created the below class and it is working fine able to create the account ,but when i am checking the challenge completion i am getting the error.

public class AccountHandler {
      public static Object insertNewAccount(String strNames)
      {
          try
          {
          Account acct = new Account();
            acct.Name = strNames;
            acct.Phone = '(415)555-1212';
            acct.NumberOfEmployees = 100;
        insert acct;
        //ID acctID = acct.Id;
// Display this ID in the debug log
//System.debug('ID = ' + acctID);
              return acct;
          }
          catch(DmlException  ex)
          {
              System.debug('Got the Error:' +ex.getMessage());
              return null;
          }
      }

}

Challenge not yet complete in My Trailhead Playground 1
Executing the 'insertNewAccount' method failed. Either the method does not exist, is not static, or does not insert the proper account.