The answer is pretty simple when you use .xcassets (Assets). What you have to do is to select your AppIcon collection and on the right pane (Inspector) select Pre-rendered icon. and that's it.
.xcassets (Assets)
Pre-rendered icon
Just as Tomasz Szulc described:
Project Navigator
App Icons
Use Asset Catalog
Attribute Inspector
iOS icon is pre-rendered
Hope that helps.
Try to remove the icon from the simulator, clean the build, and try once again to run.