Error from assemble model

I have a model to simulate the 3D concrete printing. I got an error in the assemble part which shows there are 100 unconnected node so it can not collect data and make any out put. Could you please advise how I can find the source of this error and solve it.

Regards,

Hi @Sara_Gerani

This was written specifically for Grasshopper, but goes for all questions asked on the forum - you need to provide a lot more detail if you are to get an answer to your question. Are there plugins involved? What are the nodes you are refering to?

What is “it”?
HTH, Jakob