About port script to store service name


I have installed bro-2.3 version in my laptop. To store the service name
like HTTP,FTP,TELNET,etc I have used following function:

function service_name(c: connection): string
  local p = c$id$resp_p;

  if ( p in port )
    return port[p];
    return "other";

I need to load the port.bro script in the file containing above function. I
have tried running all the three port.bro script which are already present
at paths:

The problem is I faced error in paths while loading port.bro script where as
all the other script files are loaded as per the requirement without any error.

If I have missed any port.bro script which will be useful to store the type
of service please notify me.