Storyboard does not work: Failed to instantiate the default view controller for Uimainstoryboardfile ' Main '-perhaps the designated entry P Oint is not set?

Failed to instantiate the default view controller for Uimainstoryboardfile ' Main '-perhaps the designated entry Not set?

When dragging other items on the storyboard, the error occurs when the Xcode6 runs. This means that no initial Scene is set up for the view controller in storyboard.

The solution is:

First select the currently problematic storyboard

And then Modify

This problem can be solved by checking the is initial view controller. In fact, careful observation, found that the storyboard before the check is no arrow, after the check, is this:

Description Storyboard Normal

Storyboard does not work: Failed to instantiate the default view controller for Uimainstoryboardfile ' Main '-perhaps the designated entry P Oint is not set?