Log Insight is having trouble archiving bucket data. ?

This is an error we are getting :

This alert is about your Log Insight installation on xxxxx

Log Insight is having trouble archiving bucket data. There are 8 pending buckets to archive when exactly 0 are expected. This could indicate that the archiving destination is unavailable or having performance issues. If this problem is not resolved the disk on your Log Insight installation will fill up and stop accepting data. Other unexpected issues may also occur.

Please ensure that your NFS server is reachable, has sufficient space, has permissions properly configured, and there is sufficient end-to-end NFS throughput between the Log Insight appliance and the NFS server.

You can track the status of pending buckets to be archived via the Advanced Statistics view in the Statistics tab of the xxxx. Look for the property "pending-archivings". Ideally pending-archivings will be empty and read as follows:

com.vmware.loginsight.repository.BucketManager:

  ...

  pending-archivings:

    value = {}

And the arcive test is passing OK , any ideas  ?