2020-06-25 11:12:03.971544-0300 Sidebar[1201:203518] [LayoutConstraints] Unable to simultaneously satisfy constraints. Probably at least one of the constraints in the following list is one you don't want. Try this: (1) look at each constraint and try to figure out which you don't expect; (2) find the code that added the unwanted constraint or constraints and fix it. (Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints) ( "<NSAutoresizingMaskLayoutConstraint:0x282686a30 h=-&- v=-&- UICollectionView:0x10682d200.minX == 0 (active, names: '|':UIView:0x105a06c50 )>", "<NSAutoresizingMaskLayoutConstraint:0x282686a80 h=-&- v=-&- H:[UICollectionView:0x10682d200]-(0)-| (active, names: '|':UIView:0x105a06c50 )>", "<NSLayoutConstraint:0x2826866c0 'UIView-centerX-readableContentGuide-constraint' UILayoutGuide:0x283c9cd20'UIViewReadableContentGuide'.centerX == UILayoutGuide:0x283c9ce00'UIViewLayoutMarginsGuide'.centerX (active)>", "<NSLayoutConstraint:0x282686b70 'UIView-Encapsulated-Layout-Width' UIView:0x105a06c50.width == 115 (active)>", "<NSLayoutConstraint:0x282686300 'UIView-leftMargin-guide-constraint' H:|-(108)-[UILayoutGuide:0x283c9ce00'UIViewLayoutMarginsGuide'](LTR) (active, names: '|':UICollectionView:0x10682d200 )>", "<NSLayoutConstraint:0x2826863a0 'UIView-rightMargin-guide-constraint' H:[UILayoutGuide:0x283c9ce00'UIViewLayoutMarginsGuide']-(8)-|(LTR) (active, names: '|':UICollectionView:0x10682d200 )>", "<NSLayoutConstraint:0x282686670 'UIView-trailingMargin-readableContentGuide-constraint' UILayoutGuide:0x283c9ce00'UIViewLayoutMarginsGuide'.trailing >= UILayoutGuide:0x283c9cd20'UIViewReadableContentGuide'.trailing (active)>" ) Will attempt to recover by breaking constraint <NSLayoutConstraint:0x282686670 'UIView-trailingMargin-readableContentGuide-constraint' UILayoutGuide:0x283c9ce00'UIViewLayoutMarginsGuide'.trailing >= UILayoutGuide:0x283c9cd20'UIViewReadableContentGuide'.trailing (active)> Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger. The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKitCore/UIView.h> may also be helpful. 2020-06-25 11:12:03.974697-0300 Sidebar[1201:203518] [LayoutConstraints] Unable to simultaneously satisfy constraints. Probably at least one of the constraints in the following list is one you don't want. Try this: (1) look at each constraint and try to figure out which you don't expect; (2) find the code that added the unwanted constraint or constraints and fix it. (Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints) ( "<NSAutoresizingMaskLayoutConstraint:0x282686a30 h=-&- v=-&- UICollectionView:0x10682d200.minX == 0 (active, names: '|':UIView:0x105a06c50 )>", "<NSAutoresizingMaskLayoutConstraint:0x282686a80 h=-&- v=-&- H:[UICollectionView:0x10682d200]-(0)-| (active, names: '|':UIView:0x105a06c50 )>", "<NSLayoutConstraint:0x2826866c0 'UIView-centerX-readableContentGuide-constraint' UILayoutGuide:0x283c9cd20'UIViewReadableContentGuide'.centerX == UILayoutGuide:0x283c9ce00'UIViewLayoutMarginsGuide'.centerX (active)>", "<NSLayoutConstraint:0x282686b70 'UIView-Encapsulated-Layout-Width' UIView:0x105a06c50.width == 115 (active)>", "<NSLayoutConstraint:0x2826865d0 'UIView-leadingMargin-readableContentGuide-constraint' UILayoutGuide:0x283c9cd20'UIViewReadableContentGuide'.leading >= UILayoutGuide:0x283c9ce00'UIViewLayoutMarginsGuide'.leading (active)>", "<NSLayoutConstraint:0x282686300 'UIView-leftMargin-guide-constraint' H:|-(108)-[UILayoutGuide:0x283c9ce00'UIViewLayoutMarginsGuide'](LTR) (active, names: '|':UICollectionView:0x10682d200 )>", "<NSLayoutConstraint:0x2826863a0 'UIView-rightMargin-guide-constraint' H:[UILayoutGuide:0x283c9ce00'UIViewLayoutMarginsGuide']-(8)-|(LTR) (active, names: '|':UICollectionView:0x10682d200 )>" ) Will attempt to recover by breaking constraint <NSLayoutConstraint:0x2826865d0 'UIView-leadingMargin-readableContentGuide-constraint' UILayoutGuide:0x283c9cd20'UIViewReadableContentGuide'.leading >= UILayoutGuide:0x283c9ce00'UIViewLayoutMarginsGuide'.leading (active)> Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger. The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKitCore/UIView.h> may also be helpful.