Cannot invoke 'WebSocket' with an argument list of type '(url: URL)'

[xManson]

Hello
Thanks for watching
I use xcode 9.0 . pod 1.3.1

in podfile
pod 'Starscream', '~> 2.0.3'

in source code
import Starscream
var soc = WebSocket(url: URL(string: "ws://localhost:8080/")!)

But i'm getting an error

• Cannot invoke 'WebSocket' with an argument list of type '(url: URL)'

or other case
var soc = WebSocket(url: URL(string: "ws://localhost:8080/")!, protocols: nil)
-- Type of expression is ambiguous without more context

please help

[xManson]

Sorry. it was an conflict with other class