یک warning در Vue.Js

سلام
این warn در ویو دقیقا چی میگه ؟
ممنون میشم راهنمایی بفرمایید .

[Vue warn]: Extraneous non-emits event listeners (user) were passed to component but could not be automatically inherited because component renders fragment or text root nodes. If the listener is intended to be a component custom event listener only, declare it using the "emits" option. 
  at <Home name="ali" onUser=fn > 
  at <App>