why erl_accept() encounter an ERROR

[suresh saragadam]

Hi, 
 
I am using erl_interface for connection Erlang and C
 
connection established and working fine with one system and when i am working with the same program on other system 'elr_accept' ERROR is reflected
 
if ((fd = erl_accept(listen, &conn)) == ERL_ERROR)
  {
/*      printf("Error %d %d", ERL_ERROR, fd); */
   erl_err_quit("erl_accept");
  }
 
please let me know what may the reason
 
And one big doubt can we use erl_interface with out using this fn in the example given in reference manual for connection c node

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