OHIO - Filing federal LLC business tax return & for "state", it says to file "Ohio Business Entity Tax Return".I get error & nothing happens. What Ohio form is this?

Multi-Member LLCs default to be taxed as a partnership and Ohio does not have a partnership income tax return. 

Your partnership might be required to complete other state filings, but TurboTax only supports income tax return. The software does have the state S-corporation return, if you are a s-corp. 

• Learn more from a thorough super user answer about partnerships in Ohio, here: https://ttlc.intuit.com/replies/6719175
• See TurboTax business supported state forms here: https://shop.turbotax.intuit.com/support/includes/din/fa_biz_state_833_aws.jsp