RPC; mismatch with tag analyzer::Component error in NFS ANALYZER_NFS

Hi ,

                  I Started doing nfs ANALYZER .bro script in bro 2.5
script , i the first script i am getting below error

*const ports = {111/tcp, 111/udp, 747/udp, 759/tcp, 762/udp, 764/tcp,*
*redef likely_server_ports += {ports};*

*event bro_init() &priority=5*
* {*
* Analyzer::register_for_ports(Analyzer::ANALYZER_NFS, ports);*
* }*

*event nfs_proc_getattr(c: connection, info: NFS3::info_t, fh: string,**attrs:
* print c;*

and am getting below error

944207397.280000 internal error: unknown analyzer name RPC; mismatch with
tag analyzer::Component?
Aborted (core dumped)