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Failed to instantiate the default view controller for UIMainStoryboardFile 'Main' - perhaps the designated entry point is not set?

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reason: 'could not dequeue a view of kind: UICollectionElementKindCell with identifier cell - must register a nib or a class for the identifier or connect a prototype cell in a storyboard'

3、Failed to instantiate the default view controller for UIMainStoryboardFile 'Main' - perhaps the designated entry point is not set?

Invalid asset name supplied: (null)
