Add component to Library Plecs Blockset

I believe the problem is that you don’t have a reference to the path directory containing your library model saved in MATLAB. You can either place the library model in the same folder as your current model and navigate to this as your present working directory in MATLAB, or save this path in the MATLAB list so there is a permanent link. The message is normal if you haven’t done this step and you just need to click on the library when that happens. But it won’t happen if you save the path permanently to the folder with your library model.