errors while running example

[NilStack]

while running example i got these errors by just tapping the tab item. Any suggestion?

2016-05-04 15:09:52.569 TabDrawer_Example[6767:1009026] the behavior of the UICollectionViewFlowLayout is not defined because:

2016-05-04 15:09:52.570 TabDrawer_Example[6767:1009026] the item height must be less than the height of the UICollectionView minus the section insets top and bottom values, minus the content insets top and bottom values.

2016-05-04 15:09:52.571 TabDrawer_Example[6767:1009026] The relevant UICollectionViewFlowLayout instance is <UICollectionViewFlowLayout: 0x7fac1843fe70>, and it is attached to <UICollectionView: 0x7fac18885600; frame = (0 0; 375 100); clipsToBounds = YES; gestureRecognizers = <NSArray: 0x7fac1844d650>; animations = { bounds.origin=<CABasicAnimation: 0x7fac1a849340>; bounds.size=<CABasicAnimation: 0x7fac18425610>; position=<CABasicAnimation: 0x7fac1a869610>; }; layer = <CALayer: 0x7fac184456f0>; contentOffset: {0, -64}; contentSize: {0, 0}> collection view layout: <UICollectionViewFlowLayout: 0x7fac1843fe70>.

2016-05-04 15:09:52.571 TabDrawer_Example[6767:1009026] Make a symbolic breakpoint at UICollectionViewFlowLayoutBreakForInvalidSizes to catch this in the debugger.

2016-05-04 15:09:52.581 TabDrawer_Example[6767:1009026] the behavior of the UICollectionViewFlowLayout is not defined because:

2016-05-04 15:09:52.581 TabDrawer_Example[6767:1009026] the item height must be less than the height of the UICollectionView minus the section insets top and bottom values, minus the content insets top and bottom values.

2016-05-04 15:09:52.581 TabDrawer_Example[6767:1009026] The relevant UICollectionViewFlowLayout instance is <UICollectionViewFlowLayout: 0x7fac1843fe70>, and it is attached to <UICollectionView: 0x7fac18885600; frame = (0 0; 375 125); clipsToBounds = YES; gestureRecognizers = <NSArray: 0x7fac1844d650>; animations = { bounds.origin=<CABasicAnimation: 0x7fac1a849340>; bounds.size=<CABasicAnimation: 0x7fac18425610>; position=<CABasicAnimation: 0x7fac1a869610>; bounds.origin-2=<CABasicAnimation: 0x7fac185a1e60>; bounds.size-2=<CABasicAnimation: 0x7fac185adf60>; position-2=<CABasicAnimation: 0x7fac1852a950>; }; layer = <CALayer: 0x7fac184456f0>; contentOffset: {0, -64}; contentSize: {1875, 36}> collection view layout: <UICollectionViewFlowLayout: 0x7fac1843fe70>.

2016-05-04 15:09:52.581 TabDrawer_Example[6767:1009026] Make a symbolic breakpoint at UICollectionViewFlowLayoutBreakForInvalidSizes to catch this in the debugger.

2016-05-04 15:09:52.582 TabDrawer_Example[6767:1009026] Snapshotting a view that has not been rendered results in an empty snapshot. Ensure your view has been rendered at least once before snapshotting or snapshot after screen updates.