I am unable to save the code in the above trailhead lesson. I get a Problem, Unexpected Token '01'. I am having a tough time finding a solution and surprised given its in a trailhead...
01public class EmailMissionSpecialist {
02 
03   // Public method
04   public void sendMail(String address, String subject, String body) {
05      // Create an email message object
06      Messaging.SingleEmailMessage mail = new Messaging.SingleEmailMessage();
07      String[] toAddresses = new String[] {address};
08      mail.setToAddresses(toAddresses);
09      mail.setSubject(subject);
10      mail.setPlainTextBody(body);
11      // Pass this email message to the built-in sendEmail method
12      // of the Messaging class
13      Messaging.SendEmailResult[] results = Messaging.sendEmail(
14                                new Messaging.SingleEmailMessage[] { mail });
15       
16      // Call a helper method to inspect the returned results
17      inspectResults(results);
18   }
19 
20   // Helper method
21   private static Boolean inspectResults(Messaging.SendEmailResult[] results) {
22      Boolean sendResult = true;
23      // sendEmail returns an array of result objects.
24      // Iterate through the list to inspect results.
25      // In this class, the methods send only one email,
26      // so we should have only one result.
27      for (Messaging.SendEmailResult res : results) {
28         if (res.isSuccess()) {
29            System.debug('Email sent successfully');
30         }
31         else {
32            sendResult = false;
33            System.debug('The following errors occurred: ' + res.getErrors());                 
34         }
35      }
36      return sendResult;
37   }
38 
39}