Xcode error message when uploading app on iOS 8

1052115 pts.
Tags:
iOS 8
Security
Xcode
For the past few weeks, I've been developing an app and I also recently upgraded to a iPhone 5S / iOS 8. It's been working great for my testing needs. But when I deleted the app / wanted to build it again, I keep getting this error message:
Could not launch "My App"
process launch failed: Security
It works great in the simulator. Am I getting this error message because of my recent update? If so, what should I do?

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