Plug-in parameter base class should have a constructor

This warning is generated when the base class of a plug-in parameter does not have a constructor. If a descendant class with a constructor is selected as the class for this parameter, its constructor will not be called. To avoid this problem, the base class should have a constructor.

Note the examples given in Plug-in parameters and Writing plug-ins. The Bailout base class has an empty constructor so the warning is not triggered. If ExtendedBailout would declare a constructor itself, it would be called correctly.

See Also
Plug-in parameters
Warnings