Look underneath the error and read what it says:
Constraint referencing items turned off in current configuration. Turn
off this constraint in the current configuration.
It seems as though you had some items in your storyboarrd window that had some constraints set on them, and then those items were deleted. The constraints seem to still be set.
If you remove those constraints, this error should disappear.
If you cannot find those constraints, refer to this question's answer:
Xcode Storyboard warning: Constraint referencing items turned off in current configuration. Turn off this constraint in the current configuration