xcode - Using FaceBook SDK why do I get 'NSInvalidArgumentException', reason: '-[__NSDictionaryM length]: unrecognized selector sent to instance -


this code gives error...why ?

'nsinvalidargumentexception', reason: '-[__nsdictionarym length]: unrecognized selector sent instance

 nsmutabledictionary *info = [nsmutabledictionary dictionarywithobjectsandkeys:longitude,@"longitude",latitude,@"latitude",nil];   nsmutabledictionary *params = [nsmutabledictionary dictionarywithobjectsandkeys:  info, @"venue", nil];   nsstring *graphpath = [nsstring stringwithformat:@"/%@", (id_of_event)];  fbrequest *updateevent = [fbrequest requestwithgraphpath:graphpath parameters:params httpmethod:post];  [updateevent startwithcompletionhandler: ^(fbrequestconnection *connection,                                                        nsdictionary* result,                                                        nserror *error) {

i trying set venue longitude , latitude, no matter try keep getting run time error. missing ? thought "venue" dictionary under main event , has valid keys "longitude" , "latitude". have 1 parameters got array , not dictionary ?

actually suspect these elements non writable , have add address @ @"location" see details appear.

regards


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