I'm having the same issue and it is impossible to do what is recommended once you trigger the error. You cannot delete the form & re-add it. I have to exit turbo tax to escape the error message and when I log in and try to go to some other part of my form it says "undefined" and logs me out. I have contacted customer service and had them launch an investigation. It will take 7-10 days though from today (April 21st). Hopefully this is resolved!
....WE FOUND THE GLITCH IN THE MATRIX!!
