I am preparing a 1065 LLC return with 2 members. I entered the first member's information and I'm getting an error for his social security number. What am I missing?

Secondly, when I try to add the second member on the K-1 Wks, the box lists the first member however the add new tab is grayed out. What am I missing?

This is a new client that I am entering for the first time.