invalid type for key Users, expected *_User, but got string

Question

I am trying to save a data in parse for pointer field while i am trying i received the following error as

invalid type for key Users, expected *_User,but got string

My code is as below

posts[@"Users"] = user1.objectId;

Answer 1

// User1 is _User class object so directly assign it

  posts[@"Users"] =  user1;

Saving object data in parse