App crashed on email dialoge Cancel

Hi, I am using android sdk 1.7.2, Here when I send my email to the client by using emaildialog box those are sended. If I am clicking the Draft or SaveDraft button to cancel my email, simply my application crashed. Can any one please help me in this.. Here is my snippet:

emailDialog.setSubject('My application Reports');
                emailDialog.setToRecipients(['abc.xyz@gmail.com']);             
                emailDialog.setMessageBody('<b>Dear customer<b>, <br><br>Please find the attached report file for checklisted categories from list.  <br><br><br>Thanks');
                emailDialog.setHtml(true);
                emailDialog.barColor = '#336699';
                var objAttachFile = Titanium.Filesystem.getFile('file:///data/data/com.chp.Myfile/app_appdata/export.csv'); 
                emailDialog.addAttachment(objAttachFile);