Why is this an issue?

Object types are a deprecated predecessor to class types that do not support constructors and destructors and do not descend from TObject.

They are supported for backward compatibility only, and usage is not recommended.

How to fix it

Change the object keyword to class:

  type
    TFoo = object
      // ...
    end;

  type
    TFoo = class
      // ...
    end;

Code that uses the class may need to be changed to use modern class features like constructors and destructors.