[ns] fatal error message!! with .cc file please help

[abby]

Hello I desperately need some help.  When I compile my .cc file by typing make in the ns directory I get the following error messageId: fatal: Symbol referencing errors. No output written to ns Collect2:Id returned 1 exit statusmake:*** [ns] Error 1 Does anybody know how to solve this please help.  Any response would be greatly appreciated. Thank you cc file******************************************************* #include <stdio.h>#include <stdlib.h>#include <math.h> #include "simple_flooding.h" static class simplefloodingClass : public TclClass{public:simplefloodingClass() : TclClass("Agent/simpleflooding") {}TclObject* create(int argc, const char*const* argv) {return (new simplefloodingAgent() );}}class_simpleflooding; simplefloodingAgent::simplefloodingAgent() : Agent(PT_SIMPLEFLOODING) {//initialise variablespkt_num=0;bind ("off_simpleflooding_", &off_simpleflooding_);} void simpleflooding:: recv(Packet* packet, Handler*){hdr_simpleflooding* fp = HDR_SIMPLEFLOODING(packet);//use hash table to store info about packets in hash tablePkt_Hash_Entry *hashPtr= PktTable.GetHash(fp-> source_addr, fp->pk_num);//received this packet before?if (hashPtr != NULL) {Packet::free(packet);return;} //never seen before? put in hash tablePktTable.put_in_hash(fp);broadcast_packet(packet);} void simplefloodingAgent::broadcast_packet(Packet *p)Packet* p = allockpkt();hdr_simpleflooding* fp = HDR_SIMPLEFLOODING(p);hdr_cmn* cmnh = HDR_CMN(p);hdr_ip* iph = HDR_IP(p);fp->pkt_num = pkt_count;pkt_count++;cmnh-> next_hop() = MAC_BROADCAST:iph-> src_ = fp-> source_addr;iph-> dst_.addr = MAC_BROADCAST;iph-> dst_.port = 255;  Scheduler::instance().schedule(ll,p,0.0); } int simplefloodingAgent:: command(int argc, const char*const* argv){Tcl& tcl = Tcl::instance();if (argc == 2) { if (strcasecmp (argv[1], "create") == 0) {    return TCL_OK;} if (argc == 3) { if (strcasecmp(argv[1], "set-ll") == 0) {  TclObject *obj;  if ((obj = TclObject::lookup(argv[2])) == 0) {  fprintf(stderr, "flooding node: %s lookup of %s failed\n",  argv[1],argv[2]);  return TCL_ERROR;  ll = (NsObject *) obj;  return TCL_OK;} return Agent::command(argc, argv); }} 
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