On my state return I've entered the property taxes paid and all were on my principal residence. However I cannot set "amount not on principal residence" to 0 to continue.

Leave those boxes blank. Don't enter anything in Property taxes NOT on residence or Property taxes deductible elsewhere if they don't apply to you.

If you are stuck in a loop, try deleting Schedule ICR and entering your property tax info again.

• Click Tax Tools in the left column
• Click Tools
• Select Delete a Form in Tools Center
• Scroll down to Schedule ICR
• Click Continue With My Return in the lower right

Thanks, that worked! Much appreciated!

I had this same issue and tried deleting the ice as recommended and that also did not work. Ultimately I hit a wall and used the TurboTax deluxe which cost me an additional $170! The solution was to just keep hitting continue.... The gentleman that helped me was nice and helpful but this was a total waste of money to resolve this glitch in their system. Just hit continue and see if it will let you file. 

I have entered $0 for amount NOT on principal residence and it won’t accept it

Try entering a 1 or a -1 and see what happens.