I am using Xcode version 9.2, I tried to delete the derived data, but still get an empty warning message for storybard, as shown in Figure below. I don’t know what the problem is, if the warning is empty, any idea how to fix it?

Update
I resolve the warning by changing the restriction from this 
- The left constraint is Greater Than or Equal, with the first element as TextView.Leading and the second element as Superview.Leading.Margin
- The correct constraint is Greater than or equal to with the first element as Superview.Trailing.Margin and the second element as TextView.Trailing
just changing the first and second elements for "2"

- The left constraint is Greater Than or Equal, with the first element as TextView.Leading and the second element as Superview.Leading.Margin
- " " TextView.Trailing Superview.Trailing.Margin
, ,