vplexcli java error

we are using vplex which is running on 5.5.2.02 and we are getting following error message when trying to run commands . we were able to run following command and get results earlier but now we are getting error message

vplexcli:/> ll /clusters/cluster-1/storage-elements/storage-volumes/

/clusters/cluster-1/storage-elements/storage-volumes:

: Context serch for * failed.

cause: Failure attempting to refresh properties 'strorage-volumes' on storageelements

cause:java.lang.ClassCastException