Xcode: App installation failed No code signature found


I want run app on real device ( iphone 6 or 8 )

But i get this error :

App installation failed No code signature found.

I try all below solutions but not work for me:

iOS app testing. App installation failed. No code signature found

My xcode version is 9.2

I'm tired :(

1 Answer: 

I go to project > build setting and set signing > code signing identity to iOS developer

It work fine


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