FBSOpenApplicationErrorDomain code =4 error

Question

When I\'m trying to run iOS application in Xcode 6 in iPhone 6 simulator, I\'m getting error Unable to run app in Simulator.

And error code is:

Answer 1

Reseting the Xcode will delete some bad junk which simulator has cached, so reseting is good option to resolve this issue.

iOS Simulator -> Reset Contents and Settings.