Additional Study Information: The purpose of the study is to test the safety, anti-tumor activity, and the ability of a new investigational drug called BMS-986179 (also known as anti-CD73) plus nivolumab (also known as BMS-936558) to block the protein CD73 from producing high amounts of a product known as adenosine which blocks your immune system from killing your cancer cells. Nivolumab is an anti-cancer drug that has been approved in the US, Canada and other countries for several different type of cancers.