Library not working

[shahzad1]

Process: com.shahzad.emailsender, PID: 29808 java.lang.RuntimeException: An error occurred while executing doInBackground() at android.os.AsyncTask$4.done(AsyncTask.java:415) at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:383) at java.util.concurrent.FutureTask.setException(FutureTask.java:252) at java.util.concurrent.FutureTask.run(FutureTask.java:271) at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:305) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641) at java.lang.Thread.run(Thread.java:923) Caused by: java.lang.VerifyError: Rejecting class com.sun.mail.handlers.text_plain that attempts to sub-type erroneous class com.sun.mail.handlers.handler_base (declaration of 'com.sun.mail.handlers.text_plain' appears in /data/app/~~bMgebeaVx1fmvnlsCLftBg==/com.packagename-VkOCP-ZKpGB_YkgPcHpI5w==/base.apk) at java.lang.Class.newInstance(Native Method) at javax.activation.MailcapCommandMap.getDataContentHandler(MailcapCommandMap.java:631) at javax.activation.MailcapCommandMap.createDataContentHandler(MailcapCommandMap.java:585) at javax.activation.DataHandler.getDataContentHandler(DataHandler.java:627) at javax.activation.DataHandler.writeTo(DataHandler.java:329) at javax.mail.internet.MimeUtility.getEncoding(MimeUtility.java:327) at javax.mail.internet.MimeBodyPart.updateHeaders(MimeBodyPart.java:1568) at javax.mail.internet.MimeBodyPart.updateHeaders(MimeBodyPart.java:1167) at javax.mail.internet.MimeMultipart.updateHeaders(MimeMultipart.java:522) at javax.mail.internet.MimeBodyPart.updateHeaders(MimeBodyPart.java:1526) at javax.mail.internet.MimeMessage.updateHeaders(MimeMessage.java:2264) at javax.mail.internet.MimeMessage.saveChanges(MimeMessage.java:2224) at javax.mail.Transport.send(Transport.java:123) at com.shahzad.Mail.send(Mail.java:111) at com.shahzad.SendEmailAsyncTask.doInBackground(JavaMailActivity.java:78) at com.shahzad.SendEmailAsyncTask.doInBackground(JavaMailActivity.java:69) at android.os.AsyncTask$3.call(AsyncTask.java:394) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:305)  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)  at java.lang.Thread.run(Thread.java:923)  Caused by: java.lang.VerifyError: Verifier rejected class com.sun.mail.handlers.handler_base: java.awt.datatransfer.DataFlavor[] com.sun.mail.handlers.handler_base.getTransferDataFlavors() failed to verify: java.awt.datatransfer.DataFlavor[] com.sun.mail.handlers.handler_base.getTransferDataFlavors(): [0x4] can't resolve returned type 'Unresolved Reference: java.awt.datatransfer.DataFlavor[]' or 'Reference: javax.activation.ActivationDataFlavor[]' (declaration of 'com.sun.mail.handlers.handler_base' appears in /data/app/~~bMgebeaVx1fmvnlsCLftBg==/com.shahzad.emailsender-VkOCP-ZKpGB_YkgPcHpI5w==/base.apk) at java.lang.Class.newInstance(Native Method)  at javax.activation.MailcapCommandMap.getDataContentHandler(MailcapCommandMap.java:631)  at javax.activation.MailcapCommandMap.createDataContentHandler(MailcapCommandMap.java:585)  at javax.activation.DataHandler.getDataContentHandler(DataHandler.java:627)  at javax.activation.DataHandler.writeTo(DataHandler.java:329)  at javax.mail.internet.MimeUtility.getEncoding(MimeUtility.java:327)  at javax.mail.internet.MimeBodyPart.updateHeaders(MimeBodyPart.java:1568)  at javax.mail.internet.MimeBodyPart.updateHeaders(MimeBodyPart.java:1167)  at javax.mail.internet.MimeMultipart.updateHeaders(MimeMultipart.java:522)  at javax.mail.internet.MimeBodyPart.updateHeaders(MimeBodyPart.java:1526)  at javax.mail.internet.MimeMessage.updateHeaders(MimeMessage.java:2264)  at javax.mail.internet.MimeMessage.saveChanges(MimeMessage.java:2224)  at javax.mail.Transport.send(Transport.java:123)  at com.packagename.Mail.send(Mail.java:111)  at com.packagename.SendEmailAsyncTask.doInBackground(JavaMailActivity.java:78)  at com.packagename.SendEmailAsyncTask.doInBackground(JavaMailActivity.java:69)  at android.os.AsyncTask$3.call(AsyncTask.java:394)  at java.util.concurrent.FutureTask.run(FutureTask.java:266)  at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:305)  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)  at java.lang.Thread.run(Thread.java:923)