Unable to Auto Generate Live Loads in Substructure Design

Hello,

I am designing a multi-column pier substructure for a bridge. The substructure model is connected to the superstructure so I am able to auto-generate the superstructure dead load, Braking load, and Permit Live Loads. However, the button to generate design live loads is inactive. I thought I made a mistake in the original model, I have recreated the model three times and encountered the same problem each time. Does anyone know why I can't auto-generate live loads?

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