Library subsystem cannot generate code that can be reused across models

Hello,

I am trying to generate reusable code using a library subsytem block. I have a model A that contains two other referenced models B and C. Each one of them (B and C) contains identical variant subsystems that contains several librart subsystems I followed the steps indicated here https://www.mathworks.com/help/ecoder/ug/library-based-code-generation-for-subsystems-shared-across-models.html, to configure the library subsystem. Yet I am getting this error cannot generate code that can be reused across models. As a result, it cannot reuse library code.

Caused by:

• Subsystem input port has symbolic dimensions or unsupported type.

What am I doing wrong?