Strange behavior with a project in Delphi 7

Question

I am migrating a project from Delphi 7 to Delphi XE2.

I am still working on it but when I run the project in Delphi XE2, it stopped in a function which calls a unit from a third party component. This unit was not initialized so I expected this error.

However, when I compiled the project in Delphi 7 and I got to the part where it should break like in XE2, it works normally. Therefore, I proceed to inspect this unit in the project, when i try to compile now, with the unit opened in the IDE. it show this message.

Field FormPropiedadesElemento.SpinVector does not have a corresponding component. Remove the declaration?

After I click "NO", the project runs but now stops in the same part as the Delphi XE2 project.

This problem only happens in Delphi 7 when I am seeing the code from this unit.

Any idea what could it be or how to solve it?

Answer 1

Usually, this happens because you don't have the appropriate design-time package for that component installed in the IDE.

What the error means is that you have a field in the IDE-managed part of your form declaration that does not have a corresponding component in the dfm file.