Note : This Problem does not Exist Anymore in newer XCode
If you have dragged image in your project, you must select Copy If Needed While adding any file into your project.
![enter image description here](https://i.stack.imgur.com/kqB54.png)
After Adding Image take a look at your image if it is available to target, I have face similar issue with other file types too.
In xcode9 it was not selected by default even after selecting copy if needed.
![enter image description here](https://i.stack.imgur.com/6AuOe.png)
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