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iOS

IOS8 + Xcode6 when testing swift app on device get error "dyld: Library not loaded" and I'm unable to test any device

Going slightly crazy as I've been able to test and run app on Simulator with no problems. However, as soon as I try to test on a device I get the below error. I have reloaded latest version of Xcode 6.1, IOS 8.1.1 on iPhone 5s. checked certificate etc.

Any help would be GREATLY appreciated

"dyld: Library not loaded: @rpath/libswiftCore.dylib Referenced from: /private/var/mobile/Containers/Bundle/Application/BA5D67ED-EA76-4893-AAF8-C3D23BCFC207/test1.app/test1 Reason: no suitable image found. Did find: /private/var/mobile/Containers/Bundle/Application/BA5D67ED-EA76-4893-AAF8-C3D23BCFC207/test1.app/Frameworks/libswiftCore.dylib: mmap() error 1 at address=0x10010C000, size=0x0018C000 segment=__TEXT in Segment::map() mapping /private/var/mobile/Containers/Bundle/Application/BA5D67ED-EA76-4893-AAF8-C3D23BCFC207/test1.app/Frameworks/libswiftCore.dylib"