By debug message

[Alex995bikerboy]

It only synced the inbox folder. It didn't sync the sent, draft, spam, draft folder, and it didn't sync the folders I added.
Exception:

It says

Debug message: Request already pending
Failure communicating with remote server. Please try again later.

com.zimbra.common.service.ServiceException: system failure: Synchronization of folder '/welcome to website emails' failed
ExceptionId:mid=4:1249937522494:999942ac58387344
Code:service.FAILURE
at com.zimbra.common.service.ServiceException.FAILURE (ServiceException.java:253)
at com.zimbra.cs.datasource.ImapSync.syncFailed(ImapS ync.java:298)
at com.zimbra.cs.datasource.ImapSync.syncMessages(Ima pSync.java:260)
at com.zimbra.cs.datasource.ImapSync.syncFolders(Imap Sync.java:195)
at com.zimbra.cs.datasource.ImapSync.importData(ImapS ync.java:152)
at com.zimbra.cs.offline.OfflineImport.importData(Off lineImport.java:88)
at com.zimbra.cs.offline.YMailImport.importData(YMail Import.java:53)
at com.zimbra.cs.datasource.DataSourceManager.importD ata(DataSourceManager.java:154)
at com.zimbra.cs.mailbox.LocalMailbox.importData(Loca lMailbox.java:417)
at com.zimbra.cs.mailbox.LocalMailbox.syncAllLocalDat aSources(LocalMailbox.java:389)
at com.zimbra.cs.mailbox.LocalMailbox.sync(LocalMailb ox.java:431)
at com.zimbra.cs.mailbox.LocalMailbox.syncOnTimer(Loc alMailbox.java:361)
at com.zimbra.cs.mailbox.DesktopMailbox$1.run(Desktop Mailbox.java:437)
at java.util.TimerThread.mainLoop(Unknown Source)
at java.util.TimerThread.run(Unknown Source)
Caused by: com.zimbra.common.service.ServiceException: system failure: Error while fetching message for UID 11595
ExceptionId:mid=4:1249937522494:999942ac58387344
Code:service.FAILURE
at com.zimbra.common.service.ServiceException.FAILURE (ServiceException.java:253)
at com.zimbra.cs.datasource.ImapFolderSync.checkCanCo ntinue(ImapFolderSync.java:1293)
at com.zimbra.cs.datasource.ImapFolderSync.fetchMessa ges(ImapFolderSync.java:942)
at com.zimbra.cs.datasource.ImapFolderSync.fetchMessa ges(ImapFolderSync.java:862)
at com.zimbra.cs.datasource.ImapFolderSync.syncMessag es(ImapFolderSync.java:247)
at com.zimbra.cs.datasource.ImapSync.syncMessages(Ima pSync.java:257)
... 12 more
Caused by: java.lang.IllegalStateException: Request already pending
at com.zimbra.cs.mailclient.imap.ImapConnection.sendR equest(ImapConnection.java:462)
at com.zimbra.cs.mailclient.imap.ImapRequest.send(Ima pRequest.java:77)
at com.zimbra.cs.mailclient.imap.ImapRequest.sendChec kStatus(ImapRequest.java:81)
at com.zimbra.cs.mailclient.imap.ImapConnection.uidFe tch(ImapConnection.java:297)
at com.zimbra.cs.mailclient.imap.ImapConnection.uidFe tch(ImapConnection.java:343)
at com.zimbra.cs.mailclient.imap.ImapConnection.uidFe tch(ImapConnection.java:360)
at com.zimbra.cs.datasource.ImapFolderSync.fetchMessa ges(ImapFolderSync.java:938)
... 15 more