returning a string to C

[HoffHoffyN]

Hi everyone
Im very new to GNU prolog.
Just about a week
and Ive been working on this problem but cant get past this point.
I running a program (clauseform(X,Y) //Y is the clause form of X)
and I want the Y to become a char string in C
i used arg[1]=Mk_Variable()   arg[0]=Mk_String(str);
then I call the query and
char *solution = Rd_string(arg[1])
this is where the program crashes
can someone tell me what I am doing wrong?

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