A file or directory that was opened by an NFS client was either removed or replaced on the server.
If you were editing this file, write it to a local filesystem instead. Try remounting the filesystem on top of itself or shutting down any client processes that refer to stale file handles. If neither of these solutions works, reboot the system.
The original vnode is no longer valid. The only way to get rid of this error is to force the NFS server and client to renegotiate file handles.
The symbolic name for this error is ESTALE, errno=151.