Swift + Firebase: Date Cannot convert value of type '[AnyHashable : Any]' to expected argument type 'String' -

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i trying use firebase server time create child node of uid date can store messages in time order.

this how trying it:

dbrootref.child(uid).child(servervalue.timestamp())

however error:

cannot convert value of type '[anyhashable : any]' expected argument type 'string'

this want

 uid  -- 1505348420  ---- "message" : "here message time want save"

any ideas how child node date in firebase?


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