Error using BN_rand_range() function

[Angel Martinez Gonzalez]

Hello:

I want to generate a random number making use of BN_rand_range() function.
But I obtain an error at execution time. This is my code:

error = BN_rand_range(A, claveDSA_TTP->q);
 if (error == 1)
      printf ("A obtenido correctamente\n");
 else
      printf ("Error al obtener A\n");
 printf ("A: %s\n", BN_bn2dec(A));

The error that I obtained is this:

"The instruction in "0x1002a31a" make a reference to memory in "0xd4c0ada7".
The memory can not be "read"."

I send, too, an image of the error. What is the problem?.

Thanks.

<<attachment: error.jpg>>