Recently, I have some experiments to do with MBMS in LTE. But I haven't found open source code of MBMS and ns3 does not support MBMS. So I am trying to add the features of MBMS into the LTE module.

I write the code of MBMS mac scheduler which is in charge of allocating RBGs to MultiCast group UEs, make some changes in the other files of LTE module, and send data to UEs in a "for" loop.

After "Build successfully", there is a bug:
msg="Trying to allocate twice the same uid: ns3::RrFfMacScheduler", file=../src/core/model/type-id.cc, line=107
terminate called without an active exception
Command ['/home/lilalan/workspace/nsnam/build/scratch/lte-mbms'] terminated with signal SIGIOT. Run it under a debugger to get more information (./waf --run <program> --command-template="gdb --args %s <args>").

Then I debug the program and get this:
(gdb) run
Starting program: /home/lilalan/workspace/nsnam/build/scratch/lte-mbms \<args\>
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
msg="Trying to allocate twice the same uid: ns3::RrFfMacScheduler", file=../src/core/model/type-id.cc, line=107
terminate called without an active exception

Program received signal SIGABRT, Aborted.
0x00007fffefd39425 in raise () from /lib/x86_64-linux-gnu/libc.so.6
(gdb)

I don't know why this bug happens.
Please help.