I have been trying to create a library of components to manage my modeling needs. However, I am getting an error when I use one of the components as a building block in another subsystem in the same library,
I believe this question was addressed directly with the requestor via our Support Ticketing system- can you please confirm?
Self-references in libraries are not something which we officially support. They only work if the referenced component was added to the library before the referencing component (such that the referenced component is written to the model file before the referencing component).
If you get an error while saving the library you should be able to fix it by cutting and pasting the top-level subsystem containing the referencing component.