Delete the 1099 from the program entirely. Then do not tell the program that you have a 1099. Instead, tell the program you were paid in cash. Then enter the amount you were paid. Take note that when you e-file, the fact you received a 1099 is not included anywhere on your e-filed return.
If you still get the error, then there's another way (a bit drawn out, but successful) to find the error.
