Debug message: java.lang.String cannot be cast to javax.mail.internet.MimeMultipart

Exception:

java.lang.ClassCastException: java.lang.String cannot be cast to javax.mail.internet.MimeMultipart
at com.zimbra.cs.mime.ParsedContact.parseBlob(ParsedC ontact.java:155)
at com.zimbra.cs.mime.ParsedContact.(ParsedContact.ja va:87)
at com.zimbra.cs.mailbox.InitialSync.syncContact(Init ialSync.java:897)
at com.zimbra.cs.mailbox.InitialSync.initialFolderSyn c(InitialSync.java:352)
at com.zimbra.cs.mailbox.InitialSync.prioritySync(Ini tialSync.java:395)
at com.zimbra.cs.mailbox.InitialSync.initialFolderSyn c(InitialSync.java:376)
at com.zimbra.cs.mailbox.InitialSync.initialFolderSyn c(InitialSync.java:385)
at com.zimbra.cs.mailbox.InitialSync.resume(InitialSy nc.java:196)
at com.zimbra.cs.mailbox.InitialSync.resume(InitialSy nc.java:180)
at com.zimbra.cs.mailbox.MailboxSync.sync(MailboxSync .java:186)
at com.zimbra.cs.mailbox.OfflineMailbox.sync(OfflineM ailbox.java:140)
at com.zimbra.cs.mailbox.OfflineMailbox.syncOnTimer(O fflineMailbox.java:121)
at com.zimbra.cs.mailbox.DesktopMailbox$1.run(Desktop Mailbox.java:437)
at java.util.TimerThread.mainLoop(Timer.java:512)
at java.util.TimerThread.run(Timer.java:462)

If issue persists please post description and debug information here.