Error when reconnecting key events with a button

at first, make connection button event (touch inside) file owner of view controller , select function event. function works fine.

then, change function name event. delete link of event , make new connection new function. clean , build whole application. when running new application, touch inside event not work , else works.

can tells me steps should clean environment , make button work again?

 

errr, u right clicked on files owner, , removed old event, because far had no problems far doing that, otherwise @ top, press, product, clean..

 

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