firebase swift 3 conversion : Cannot convert value of type '(_) -> ()' to expected argument type '((Error) -> Void)?

Question

I convert my code to swift 3 , and Im getting the following error when trying to read some data:

Cannot convert value of type '(_) -> ()' to expected argument type '((Error) -> Void)?'

Ref.observe(.value, with: { snapshot in
   print(snapshot)
}, withCancel: { error in  //the error appear here
        print(error.description)
})

Answer 1

As I said in the comment you have to set the types. I am really glad I helped you. Thank you for your appreciation. Happy coding.

ref.observe(.value, with: { (snap: FIRDataSnapshot) in }, withCancel: { (error: Error) in })