MKTileOverlay not defined - ios

I have a simple map application using openStreetMap that works well on all iPhone simulators ( xcode 6.1, IOS 7.1 & 8.1 ). However, when I compile on a real device (iPhone 4 iOS 7.1), I encounter some issues (see screenshot), the application doesn't recognize some classes, such as MKTileOverlay, MKOverlayRender, etc.
The weirdest thing is that it worked a few weeks ago, then, after I worked on another project, when I come back to this one, the problem appeared.
Maybe the problem is coming from Xcode or the device's configuration?
I searched for several days, without success, so could someone tell me where I went wrong?

Sorry I couldn't post a screenshot, I hadn't enought point from you guys ^^! I did delete the framework a lot of times, but this don't seem to work, I also try to unistall xcode & re-install it, & the bug was fix.
I hope this won't happend to you that was horrible.
Thanks for your answer guys !

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WatchKit Simulator Won't Load App
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see here

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SOLVED
OK, so I managed to fix it.
I had to...
Quit Xcode.
Delete Derived Data.
Delete the app from my phone.
Restart my Mac and Xcode.
Rerun "pod update" for my cocoapods. (I tried this before with no luck).
Then start it all up again.
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Oh well...???
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I always use the top one.. (better ideas welcome)

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