App Installation failed, No code signature found.

Right click on XCode.app file in your Application folder and Go to the path : /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk

Open file SDKSettings.plist and check value for CODE_SIGNING_REQUIRED. If it is set 'NO' then set it 'YES'.

Now relaunch the XCode. If it does not work again, then clear XCode DerivedData folder.

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