The document "Main.Storyboard" could not be opened. Unrecognized file content

Question

I cannot open my Storyboard after updating from Xcode 7 to Xcode 8. Can anyone help? Inside it did not show any error.

Answer 1

I just find a solution as below:

Make sure the storyboard extension should start from lower case s. Ex: it should be "Test.storyboard" not "Test.Storyboard"