ffi.error: struct tr_tcp_config: wrong total size (cdef says 24, but C compiler says 48). fix it or use "...;"

[jayeshkumarbhoi]

Hello I have started using cffi==1.16.0

Now at function call rtrlib/rtr_manager.py it through bellow error

  File "/mydir/rtr_myscript.py", line 52, in connectRtr
    mgr = RTRManager(server, 332)
          ^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/rtrlib-0.1-py3.12-linux-x86_64.egg/rtrlib/rtr_manager.py", line 138, in __init__
    self.tcp_config = ffi.new('struct tr_tcp_config *')
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
ffi.error: struct tr_tcp_config: wrong total size (cdef says 24, but C compiler says 48). fix it or use "...;" as the last field in the cdef for struct tr_tcp_config to make it flexible

so what could be the reason for this issue?