This issue may caused by the file msg_sync_bookmark file / msg_retry_bookmark being corrupted; or a possible mismatch to the latest msgsync.imss../ msgretry.imss..file.

To resolve the issue:

1. Go to {imss}/bin/ folder.
2. Check the content of msg_sync_bookmark file / msg_retry_bookmark file using a text editor. The format should look like the following:

   msg_sync_bookmark:  00000000000xxxxx.msgsync.imss.<date>.<count>
   msg_retry_bookmark:  00000000000xxxxx.msgretry.imss.<date>.<count>

3. If the <date>.<count> shown in the bookmark file points to an older or non-existent file, back up and update the content of msg_sync_bookmark file / msg_retry_bookmark file with the latest {imss}/log/msgsync.imss.<date>.<count> / {imss}/log/msgretry.imss.<date>.<count> file info.
   1. Use "ll" or "ls -l" command to check the latest {imss}/log/msgsync.imss.<date>.<count> / {imss}/log/msgretry.imss.<date>.<count> file size. Assume that latest file info with the following:

      -rw-r--r-- 1 imss imss 691 Jul 31 19:38 /opt/trend/imss/log/msgretry.imss.20160731.0001
      -rw-r--r-- 1 imss imss 343449 Jul 31 20:52 /opt/trend/imss/log/msgsync.imss.20160731.0001

   2. The correct msg_sync_bookmark file / msg_retry_bookmark file content should be:

      msg_sync_bookmark:  0000000000000691.msgsync.imss.20160731.001
      msg_retry_bookmark:  0000000000343449.msgretry.imss.20160731.001

   3. If the bookmark file content is not correct, update it with the correct information.
4. Restart the IMSS/IMSVA Manager Service and verify.