From my own experience, it appears that you answered a question in warnings just before filing and likely answered no. If it is available to you, you can choose refile, once you are sure the entry has been cleared. You will have to go through the return process again, but it should allow you to refile once the error is corrected. If you don't have access to refile, you can redo the return and click ignore on the warning about sale of residence.
