iOS to Parse.com - SaveInBackground Object ID is null -

i struggling find why getting null value when using saveinbackgroundwithblock parse.com. sure missing something, have tried both if (!error) , if(succeeded) same result object created eventid (the objectid) null... suggestions?

thanks in advance!

[event saveinbackgroundwithblock:^(bool succeeded, nserror *error) {                     if (!error) {                         [commonhelper hidebusyview];                         eventobj *obj = [[eventobj alloc] init];                         obj.eventid = event.objectid;                         obj.eventname = strnameevent;                         obj.eventdatetime = self.dateevent;                         obj.eventaddress  = straddress;                           nslog(@"eventid: %@",self.eventobj.eventid);                          previewinvite *invitepreview =[[previewinvite alloc] init];                         invitepreview.eventobj = self.eventobj;                          [self.navigationcontroller pushviewcontroller:invitepreview animated:yes];                     }                     else                     {                         nsstring *errorstring = [error userinfo][@"error"];                         [commonhelper showalert:errorstring];                         [commonhelper hidebusyview];                      }                 }]