When using dispinterface types, you must always be sure to include a GUID specification for them.
program Produce; type IBase = dispinterface end; begin end.
In the example shown here, the dispinterface type does not include a GUID specification, and thus causes the compiler to emit an error.
program Solve; type IBase = dispinterface ['{00000000-0000-0000-0000-000000000000}'] end; begin end.
Ensuring that each dispinterface has a GUID associated with it will cause this error to go away.
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