xcode - ios 8 multipeer connectivity error on updateChat -

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http://radar.oreilly.com/2014/09/multipeer-connectivity-on-ios-8-with-swift.html

i have been following tutorial create group chat, running error. cannot invoke 'updatechat' argument list of type '(nsdata, frompeer: mcpeerid!)'

does know how correct this?

i figured out: 

self.updatechat(msg string, frompeer: peerid!)

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