The analyzer detected a possible error related to dependency property registration. A dependency property was defined but wasn't initialized: it will cause an error when trying to access the property using SetValue / GetValue.
class A : DependencyObject { public static readonly DependencyProperty CurrentTimeProperty; static A(){ /* CurrentTimeProperty not initialized */ } ....
Bad refactoring or copy-paste may result in leaving a dependency property unregistered. The following is the fixed version of the code above:
class A : DependencyObject { public static readonly DependencyProperty CurrentTimeProperty; static A() { CurrentTimeProperty = DependencyProperty.Register("CurrentTime", typeof(DateTime), typeof(A)); } ....