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tanushree roy 6tanushree roy 6 

Add a method to a class in trailhead

I did this code there is no error showing when I save this code but still trailhead showing me error..
public class OlderAccountsUtility {
    public static void updateOlderAccounts() {
    Account[] oldAccounts = [SELECT Id, Description FROM Account ORDER BY CreatedDate ASC LIMIT 5];
    //update the Description field
    for (Account acct : oldAccounts) {
        acct.Description = 'Heritage Account';
   update oldAccounts;

and the error is --
Challenge Not yet complete... here's what's wrong: 
The 'updateOlderAccounts' method did not update account records as expected 
Note: you may run into errors if you've skipped previous steps.

And one more thing I want to know that where is the Start Tour option in developer console ??
please help me out..

thanks and regards
Tanushree Roy
There's no answer here and i have the same problem nearly two years later...