nfs-ganesha service fails to start :Cannot bind RQUOTA tcp6 socket, error 98 (Address already in use)

Issue

nfs-ganesah fails to start with the following errors:

2/01/2017 19:55:06 : epoch 48270000 : XXX : ganesha.nfsd-25787[main] Bind_sockets_V6 :DISP :WARN :Cannot bind RQUOTA tcp6 socket, error 98 (Address already in use)
12/01/2017 19:55:06 : epoch 48270000 : XXX : ganesha.nfsd-25787[main] Bind_sockets :DISP :FATAL :Error binding to V6 interface. Cannot continue.
12/01/2017 19:55:06 : epoch 48270000 : XXX : ganesha.nfsd-25787[main] unregister_fsal :FSAL :CRIT :Unregister FSAL GLUSTER with non-zero refcount=18
12/01/2017 19:55:06 : epoch 48270000 : XXX : ganesha.nfsd-25787[main] glusterfs_unload :FSAL :CRIT :FSAL Gluster unable to unload. Dying ...