logic - Undefined procedure error in prolog -


i'm new in prolog , have unknown error ! error:

 error: sa/0: undefined procedure: {}/1  exception: (7) {s=abeer-> (parent(ahmad, abeer)->write('the father ahmad \n');write('no father !'));write('nothing \n')} ?

this code:

male(ahmad). female(abeer). parent(ahmad,abeer).  sa:-     write('enter car: \n'),     read(fe),     {  fe = abeer     -> (  parent(ahmad,abeer)        -> write('the father ahmad \n')        ;  write('no father !')        )         ;  write('nothing \n')     }.


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